Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value
t Subscript alpha divided by 2tα/2,
(b) find the critical value
z Subscript alpha divided by 2zα/2,
or (c) state that neither the normal distribution nor the t distribution applies.Here are summary statistics for randomly selected weights of newborn girls:
nequals=243243,
x overbarxequals=29.329.3
hg,
sequals=6.56.5
hg. The confidence level is
9999%.
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A.
t Subscript alpha divided by 2tα/2equals=nothing
(Round to two decimal places as needed.)
B.
z Subscript alpha divided by 2zα/2equals=nothing
(Round to two decimal places as needed.)
C.
Neither the normal distribution nor the t distribution applies.
In: Statistics and Probability
Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value
t Subscript alpha divided by 2tα/2,
(b) find the critical value
z Subscript alpha divided by 2zα/2,
or (c) state that neither the normal distribution nor the t distribution applies.Here are summary statistics for randomly selected weights of newborn girls:
nequals=243243,
x overbarxequals=29.329.3
hg,
sequals=6.56.5
hg. The confidence level is
9999%.
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A.
t Subscript alpha divided by 2tα/2equals=nothing
(Round to two decimal places as needed.)
B.
z Subscript alpha divided by 2zα/2equals=nothing
(Round to two decimal places as needed.)
C.
Neither the normal distribution nor the t distribution applies.
In: Statistics and Probability
A study was conducted to explore the relationship between a child's birth order and the chances of becoming a juvenile delinquent. The participants were a random sample of girls enrolled in public high schools in a large city. Each girl filled out a questionnaire that asked for their birth order and measured whether they had shown delinquent behavior. The data are given in the table below. Test at the 0.01 significance level.
Yes No
Oldest 24 285
In-Between 29 247
Youngest 35 211
Only child 23 70
SHOW STEP BY STEP
A) Calculate all the expected values
B)Calculate the contributions to the chi-squared statistic, label which each is
C) Which cell will contribute the most to the chi-squared statistic
D) Which cell will contribute the least to the chi-squared statistic
E)Calculated the chi-squared statistic
In: Statistics and Probability
Assume that different groups of couples use a particular method of gender selection and each couple gives birth to one baby. This method is designed to increase the likelihood that each baby will be a girl, but assume that the method has no effect, so the probability of a girl is 0.5 Assume that the groups consist of 22 couples. Complete parts (a) through (b) below
a.Find the mean and the standard deviation for the numbers of girls in groups of 22 births.
The value of the mean is =_______. (Type an integer or a decimal. Do not round.)
The value of the standard deviation is =________. (Round to one decimal place as needed.)
b.Use the range rule of thumb to find the values separating results that are significantly low or significantly high.
-Values of _________girls or fewer are significantly low. (Round to one decimal place as needed.)
-Values of__________girls or greater are significantly high. (Round to one decimal place as needed.)
In: Statistics and Probability
In a family with 7 children, excluding multiple births, what is
the probability of having exactly 2 girls?
Assume that having a boy is as likely as having a girl at each
birth.
A coin is tossed 8 times.
a) How many different outcomes are possible?
b) What is the probability of getting exactly 2 heads?
c) What is the probability of getting at least 2 heads?
d) What is the probability of getting at most 4 heads?
In the United States, voters who are neither Democrat nor Republican are called Independent. It is believed that 13% of voters are Independent. A survey asked 26 people to identify themselves as Democrat, Republican, or Independent.
A. What is the probability that none of the people are Independent?
Probability =
B. What is the probability that fewer than 5 are Independent?
Probability =
C. What is the probability that more than 2 people are Independent?
Probability =
In: Statistics and Probability
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 19 m/s at an angle 49 degrees; with respect to the horizontal. Sarah catches the ball 1.5 meters above the ground.
1. What is the maximum height the ball goes above the ground?
2. What is the distance between the two girls?
3. After catching the ball, Sarah throws it back to Julie. The ball leaves Sarah's hand a distance 1.5 meters above the ground, and is moving with a speed of 14 m/s when it reaches a maximum height of 14 m above the ground.
What is the speed of the ball when it leaves Sarah's hand?
4. How high above the ground will the ball be when it gets to Julie? (note, the ball may go over Julie's head.)
In: Physics
Question 3 (35 marks – ALL CALCULATIONS MUST BE SHOWN)
The market for fidget spinners has been described by the following supply and demand functions:
Demand: P = 13 – 0.2Q
Supply: P = 4 + 0.4Q
where
P = the price in dollars
Q = the number of fidget spinners sold per month, in thousands.
a) Construct a graph of supply and demand for this market showing all intercepts. What are the equilibrium prices and quantities? Show these on your graph.
b) At the market equilibrium price, what would be the total monthly revenue?
c) Calculate consumer surplus at the market equilibrium and indicate this surplus as an area on your diagram. Interpret the meaning of the value you generate.
d) Calculate producer surplus at the market equilibrium and indicate this surplus as an area on your diagram. Interpret the meaning of this value.
e) School children (the main purchasers of fidget spinners) last year exhibited a change in tastes such that fidget spinners are much less popular. This means that at any price, the quantity demanded of fidget spinners has shrunk by 65%. The new demand equation is then
P = 4.55 – 0.2Q
Sketch it on your graph.
f) Calculate the new equilibrium price and quantity after the end of the craze and show them on your graph.
In: Economics
Problem Set 2: The One-way ANOVA
Research Scenario: As part of a new prevention program, a clinical psychologist wants to see whether feelings of alienation differ as a function of immigration status in a local high school. She divides volunteer students into three categories: first-generation immigrants, second-generation immigrants, and non-immigrants. She then administers an instrument assessing feelings of alienation, where higher scores indicate stronger feelings of alienation from peers, adults, and society in general. Is there a difference in alienation scores among these three groups?
Using this table, enter the data into a new SPSS data file and run a one-way ANOVA to test whether there is a difference in feelings of alienation among the three groups. Create a boxplot to show the difference in alienation scores among the three groups.
Data: First generation immigrants: 35,39,34,37,36,23,39
Second generation immigrants : 26,37,28,29,36,25,18
Third generation immigrants: 29,22,17,25,19,30,16
In: Statistics and Probability
Case Study 1: Securing your home computer
You just purchased a brand new computer for your home environment.
It comes with the latest operating system, Internet connectivity
and all accessories to complete your home office and school
activities. You also have an Internet Service Provider where you
can easily use the existing network to connect to the Internet and
to perform some online banking.
Describe the steps you plan to go through to ensure this new
computer system remains as secure as possible. Be sure to discuss
the details of firewall settings you plan to implement, browser
privacy and security settings, and recommended software (e.g.,
Anti-virus and others) you will install. Also, describe your
password strength policy you plan to adopt, and what you envision
to do to ensure your online banking site is encrypted and uses the
proper certificates.
Discussion of operating system patches and application updates
should also be included. As you discuss these steps, be sure to
justify your decisions bringing in possible issues if these steps
are not followed. You can discuss this for a specific type of
computer (e.g. MAC or PC) to make the scenario more appropriate for
your environment.
In: Computer Science
1. Superior Bake Shop sells a variety of baked goods online. Attributes of Baked Good include ProductID, ProductName, Product Category, Weight, and Price. Attributes of Customer include CustomerID, CustomerName, and CustomerAddress (composed of Street, City, State, and ZipCode). Customers place orders with Superior BakeShop. Attributes of order are OrderID and OrderDate. All customers have placed at least one order and customers may place many orders over time. Each order is placed by a single Customer. Orders can include one or more baked good. A baked good can be included in one or more order. Superior Bake Shop keeps track of the quantity of each baked good that is included in an order.
2. Blue Orchard Bake Shop (BOBS) offers a variety of baking workshop. BOBS keeps track of the workshops it offers as well as its teachers and students. Attributes of workshop include WorkshopID, Date, Time, and Fee. Attributes of teacher include TeacherID, TeacherName, (composed of FirstName, MiddleInitial, and LastName), PaymentPerWorkshop, and Skills. Many teachers have more than one skill. Attributes of student include StudentID, StudentName (composed of FirstName, MiddleInitial, and LastName), StudentAddress (composed of Street, City, State, and ZipCode), DateOfBirth, and Age. Students can participate in more than one workshop, but must participate in at least one workshop. Each workshop can have multiple students, but must have at least one student. All workshops are taught by a single teacher. Teachers can teach any number of workshops including zero in the case of a new teacher who has not yet offered a workshop.
3. Main Street Catering has residential, business, and school clients. Attributes of residential clients include ClientNumber, ClientName (composed of FirstName, MiddleInitial, and LastName), ClientAddress (composed of Street, City, State, and ZipCode), and NearestCrossStreets. For each residential client, the two nearest cross streets are stored. Attributes of business clients include ClientNumber, BusinessName, ClientAddress (composed of Street, City, State, and ZipCode), and AnnualCateringBudget. Attributes of school clients include ClientNumber, SchoolName, SchoolDistrictCode, and ClientAddress (composed of Street, City, State, and ZipCode). Some residential clients are also business clients, and some residential clients are also school clients. Main Street Catering has a few clients who are neither residential, nor business, nor school clients.
Draw a conceptual data model to model the scenario in each problem. Use the model constructs (e.g., the material on the E-R model and the enhanced E-R model) from chapters 2 and 3 as appropriate and follow the modeling conventions used in the example problems in the online lessons. Do not use the modeling conventions shown in Figure 2-22 of the Hoffer textbook which illustrate a data model in Visio notation. Be sure to include all appropriate completeness constraints, disjointness constraints, and subtype indicators in your conceptual data models.
In: Computer Science