Question
In: Statistics and Probability
Each member of a random sample of 18 financial experts was asked to predict the rate...
Each member of a random sample of 18 financial experts was
asked to predict the rate of inflation for the coming year. Assume
that the predictions for the whole population of busfinancial
experts follow a normal distribution with standard deviation
2.2%.
a.) The probability is 0.10 that the sample standard deviation
is bigger than what number?
b.) The probability is 0.001 that the sample standard
deviation is less than what number?
c.) Find any pair of numbers such that the probability that
the sample standard deviation that lies between these numbers is
0.999.
please explain step by step and which table u have used and
how u get to the result.
Solutions
orchestra answered 1 year agoRelated Solutions
Each member of a random sample of 19 business economists was asked to predict the rate...
Each member of a random sample of 19 business economists was
asked to predict the rate of inflation for the coming year. Assume
that the predictions for the whole population of business
economists follow a normal distribution with standard deviation
1.5%.
a. The probability is 0.001 that the sample standard deviation
is bigger than what number?
b. The probability is 0.05 that the sample standard deviation is
less than what number?
c. Find any pair of numbers such that the...
A random sample of 172 students was asked to rate on a scale to from 1...
A random sample of 172 students was asked to rate on a scale to
from 1 (not important) to 5 (extremely important) health benefits
as a job characteristic (note that the rating scale can also have
decimals, i.e. a student can give a rating of 1.32). The sample
mean rating was 3.31, and the sample standard deviation was 0.70.
For a type I error of 1% (alpha), can you be reasonably certain
that the average rating is more than 3...
A ski resort asked a random sample of guests to rate their satisfaction on various attributes...
A ski resort asked a
random sample of guests to rate their satisfaction on various
attributes of their visit on a scale of 1–5 with 1 = very
unsatisfied and 5 = very satisfied. The estimated regression model
was Y = overall satisfaction score, X1
= lift line wait, X2 = amount of ski trail
grooming, X3 = safety patrol visibility, and
X4 = friendliness of guest services.
Predictor
Coefficient
Intercept
2.9833
LiftWait
0.1458
AmountGroomed
0.2562
SkiPatrolVisibility
0.0428
FriendlinessHosts
−0.1298...
A local county has an unemployment rate of 6.2%. A random sample of 18 employable people...
A local county has an unemployment rate of 6.2%. A random sample
of 18 employable people are picked at random from the county and
are asked if they are employed. The distribution is a binomial.
Round answers to 4 decimal places.
a) Find the probability that exactly 4 in the sample are
unemployed.
b) Find the probability that there are fewer than 3 in the
sample are unemployed.
c) Find the probability that there are more than 4 in the...
4. Nationally, the unemployment rate for teenage males is 18%. A random sample of 323 teenage...
4. Nationally, the unemployment rate
for teenage males is 18%. A random sample of 323 teenage males in
your area reveals an unemployment rate of 21.7%. Are our local
teens more likely to be unemployed? (20%) This question
is an example of statistical research using hypothesis
testing. You will need to use the 5 step model of
hypothesis testing to test for significance at a=.01.
State assumptions
State the null hypothesis and the alternative
hypothesis
State the appropriate hypothesis test...
A random sample of 500 male and female adults was asked the amount of time each...
A random sample of 500 male and female adults was asked the
amount of time each person spent watching TV last week. Their
responses are shown at the right. At the 0.05 significance level,
does it appear that the amount of time spent watching TV is related
to the gender of the viewer?
Hours/Gender
Male
Female
Total
Under 8
90
110
200
8 to 15
85
75
160
15 or more
75
65
140
Total
250
250
500
Which test...
2. A random sample of 395 people were surveyed and each person was asked to report...
2. A random sample of 395 people were surveyed and each person
was asked to report the highest education level they obtained. The
data that resulted from the survey is summarized in the following
table:
High School Bachelors
Masters Ph.d. Total
Female 60 54 46
41 201
Male 40 44 53
57 194
Total 100 98 99
98 395
a. Are gender and education level dependent at 5% level of
significance? (6mks)
b.State and explain two methods of studying...
A random sample of sixty (60) long distance truck drivers were each asked if they often...
A random sample of sixty (60) long distance truck drivers were
each asked if they often feel tired while driving. Forty five (45)
of the truck drivers replied “yes”.
(a) What is the sample proportion of long distance truck drivers
who often feel tired while driving (two decimal places)? Type only
the numeric answer in the box .
The government introduced new laws requiring long distance truck
drivers to take minimum rest breaks. Prior to introducing the new
laws, the...
A random sample of sixty (60) long distance truck drivers were each asked if they often...
A random sample of sixty (60) long distance truck drivers were
each asked if they often feel tired while driving. Forty five (45)
of the truck drivers replied “yes”.
(a) What is the sample proportion of long distance truck drivers
who often feel tired while driving (two decimal places)? Type only
the numeric answer in the box .
The government introduced new laws requiring long distance truck
drivers to take minimum rest breaks. Prior to introducing the new
laws, the...
A random sample of n1 = 18 winter days in Denver gave a sample mean pollution...
A random sample of n1 = 18 winter days in
Denver gave a sample mean pollution index x1 =
43. Previous studies show that σ1 = 13. For
Englewood (a suburb of Denver), a random sample of
n2 = 17 winter days gave a sample mean
pollution index of x2 = 48. Previous studies
show that σ2 = 15. Assume the pollution index
is normally distributed in both Englewood and Denver. Do these data
indicate that the mean population pollution...
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- Discuss different security websites or network and security informational sites that you may already monitor and...
- 3.) The function remove of the class arrayListType removes only the first occurrence of an element....
- Find the electric field vector anywhere in the plane of a dipole. Let the charge value...
- The heights of South African men are normally distributed with a mean of 69 inches and...
- The devices designed for the purpose of addressing security in the network generate a number of...
- For the reaction 2Co3+(aq)+2Cl−(aq)→2Co2+(aq)+Cl2(g). E∘=0.71 V what is the cell potential at 25 ∘C if the concentrations...
- Consider the following information regarding the performance of a money manager in a recent month. The...
ADVERTISEMENT