Question 11 pts

What is the critical value of z (that is, z*) for the 99% confidence level?

Group of answer choices

1.645

2.576

1.960

3.000

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Question 21 pts

The margin of error for your confidence interval will be:

Group of answer choices

.47

.36

.07

3.34

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Question 31 pts

Suppose the correct confidence interval is from 2 to 4 hours. Which of the following would be the correct interpretation of this interval?

Group of answer choices

There is a 99% probability the mean time MU students spend online per day is between 2 and 4 hours.

We are 95% sure the mean time MU students spend online per day is between 2 and 4 hours.

We are 95% sure the mean time the students surveyed spend online per day is between 2 and 4 hours.

99% of MU students spend between 2 and 4 hours online per day.

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Question 41 pts

Suppose you wish to decrease the margin of error to a quarter hour (that is .25 hours), still having 99% confidence in your conclusion. How many students must be surveyed?

Group of answer choices

180

212

98

13

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Question 51 pts

The margin of error (MOE) will decrease (resulting in a narrower interval and a more accurate estimate) in all the following situations EXCEPT which one?

Group of answer choices

A lower confidence level is used.

A larger sample size is used.

The variation in hours spent online is lower.

The sample is not a random sample.

1. A new method of packaging eggs is being tested. The manager is interested in estimating the proportion of eggs that will be broken upon delivery. A shipment of 3000 eggs was examined.

Choose the confidence interval or hypothesis test that will help with the above research.

a. Confidence Interval for a Proportion

b. Confidence Interval for a Population Mean

c. Hypothesis Test for a Population Mean

d. Hypothesis Test for a Population Proportion

2.

Are blondes more likely to have a boyfriend than the rest of the single world? Currently 38% of all single women have a boyfriend. A random sample of 300 blondes was investigated.

Choose the confidence interval or hypothesis test that will help with the above research.

a. Confidence Interval for a Proportion

b. Confidence Interval for a Population Mean

c. Hypothesis Test for a Population Proportion

d. Hypothesis Test for a Population Mean

3.

At UCLA the average student unit load is 4.5 units. 50 LTCC students were asked how many units they are taking next quarter. Is there evidence to suggest that LTCC students take fewer units on average than UCLA students?

Choose the confidence interval or hypothesis test that will help with the above research.

a. Hypothesis Test for a Population Proportion

b. Confidence Interval for a Proportion

c. Hypothesis Test for a Population Mean

d. Confidence Interval for a Population Mean

4. We wish to estimate the average number of minutes students spend on social media in a day. 59 students are asked how many minutes they spent in the last 24 hours on social media.

a. Hypothesis Test for a Population Proportion

b. Confidence Interval for a Proportion

c. Confidence Interval for a Population Mean

d. Hypothesis Test for a Population Mean

Match each scenario with the SINGLE MOST appropriate test. Each answer choice may be used once, more than once, or not at all. Assume all data collection is by random sampling unless the question suggests otherwise.

AP Tests:

The effort to reward city students for passing Advanced Placement tests is part of a growing trend nationally and internationally. Financial incentives are offered in order to lift attendance and achievement rates. One such program in Dallas, Texas offers $100 for every AP test on which a student scores a three or higher. A wealthy entrepreneur decides to experiment with the same idea of rewarding students to enhance performance, but in Chicago. He offers monetary incentives to students at an inner-city high school. He takes a random sample of 122 students who took the AP tests. Twelve tests are scored at 5, the highest possible score. There are 60 tests with scores of 3 or 4, and 50 tests with failing scores of 1 or 2. Historically, of tests that are taken at this school each year, 8% score 5, 38% score 3 or 4, and the remaining are failing scores of 1 or 2.

incase you need previous info, i post all questions on, but you first need to answer part d. thx!

1. a) Provide a table showing the percentages of students at each score level before and after the

   monetary incentive. Discuss what you are seeing.

2. b) Althoughwemayseeadifferenceinpercentageswewillneedtoshowthechangeisstatistically

   significant. Conduct a hypothesis test that determines, at the 5% significance level, whether the monetary incentive has resulted in a higher proportion of scores of 5, the highest possible score. Show all your work and thoroughly describe your steps.

3. c) Conduct a hypothesis test that determines if the monetary incentive has decreased the proportion of failing scores of 1 and 2. Use a 5% significance level. Show all your work and thoroughly describe your steps.

4. d) Assestheeffectivenessofmonetaryincentivesinimprovingstudentachievement.

Q2. Proportions (percentages) in a Z Distribution

A large population of scores from a standardized test are normally distributed with a population mean (μ) of 50 and a standard deviation (σ) of 5. Because the scores are normally distributed, the whole population can be converted into a Z distribution. Because the Z distribution has symmetrical bell shape with known properties, it’s possible to mathematically figure out the percentage of scores within any specified area in the distribution. The Z table provides the percentages corresponding to any Z score.

a. John has a score of 55. What is John’s Z score?

b. What is the percentage of students that score lower than John?

c. Based on the Z table, if 1000 students take the test, how many of them would likely score above John’s score? (Round the answer to a whole number)

d. Tom has a score of 40. What is Tom’s Z score?

e. What is the percentage of students that score lower than Tom?

f. What is the percentage of students that score between John and Tom?

g. Based on the Z table, if 1000 students take the test, how many of them would likely score below Tom’s score?

h. Anna scores at the 99^th percentile on this exam, what is her Z score?

Hint: A score at 99^th percentile means 99% of the scores are below this score.

i. Based on the result of the previous question, what is Anna’s actual score on the exam?

j. What would be the median score on this exam?

Hint: Review the definition of “median” and then figure out the percentage of scores below (or above) this score.

1) An elementary school teacher is interested in assessing the effectiveness of a new technique for the students to learn their spelling words. He learns a new technique over the summer and is eager to find out if it really works better. He wants to be able to make a comparison and knows he needs two groups. He decides that he will use the new technique for the group of students learning the harder spelling words and the old technique for those learning the easier spelling words. He compares average spelling performance for the two techniques. What is the biggest threat to the internal validity?

A) testing effect

B) history effect

C) attrition / maturation effect

D) selection effect

2) In this example, identify a confounding variable:

A nutritionist is investigating the effects of eating oatmeal for breakfast. He asks all of his participants to eat about 350 calories for breakfast every day for six months. He assigns the experimental group to eat oatmeal with honey. He asks the control group to eat anything other than oatmeal and honey. He then tests their blood levels for cholesterol and other substances.

A) eating oatmeal

B) eating honey

C) eating 350 calories for breakfast

D) eating breakfast

3) In this example, identify a confounding variable:

A school psychologist hypothesizes that fear negatively influences test performance. To test this, one group of 100 students watches a video containing fear provoking images of spiders crawling on people. The other group of 100 students listens to soothing jazz music. Both groups take a test of their general knowledge.

A) fear

B) students

C) school psychologist

D) visual stimulation

Why are legal foundations important in valuing real estate?

List and briefly explain the four types of ownership estates in use today.

List and describe the four types of leasehold estates.

List and describe the three types of easements.

11-3 Spotlight on crime stoppers - Communications. The Baton Rouge Crime Stoppers (BCS) offered a reward for information about the "South Louisiana Serial Killer." The information was to be provided via a hotline. Dianne Alexander had survived an attack by a person suspected of being the killer. She identified a suspect in a police lineup and later sought to collect the reward. BCS refused to pay because she had not provided information via the hotline. [ Alexander v. Lafayette Crime Stoppers, Inc, 38 So.3d 282 (La.App 3 Dist. 2010)]   

What is the case about? (Answer in a brief concise summary no longer than 5 sentences.)

At what point in the controversy or dispute involved in this case should one of the parties have sought legal advice? (Answer in one sentence.)

What specific help would the party want from the lawyer they consult with? (Answer in one sentence.)

What is the principal reason that you felt that it was important at that point in the controversy or dispute for the party to seek legal advice? (Answer in 2 to 3 sentences.)

If you decided to use legal assistance, how would you go about finding an attorney? (Answer in 2 to 3 sentences.)

What information do you feel the party should provide to the attorney during their first discussion? (List at least seven items of information, each listed in a separately numbered paragraph.

A woman undergoing IVF has conceived sextuplets (6 babies). The doctors are recommending selective reduction (killing 3 of the babies in utero) to improve the chances of the other babies’ survival. Resolve the issue using the 7 step decision model.

The Seven-Step Decision Model

I. Determine the facts by asking the following questions: What do we need to know? Who is involved in the situation? Where does the ethical situation take place? When does it occur?

II. Define the precise ethical issue. For example, is it a matter of fairness, justice, morality, or individual rights?

III. Identify the major principles, rules, and values. For example, is this a matter of integrity, quality, respect for others, or profit?

IV. Specify the alternatives. List the major alternative courses of action, including those that represent some form of compromise. This may be a choice between simply doing or not doing something.

V. Compare values and alternatives. Determine if there is one principle or value, or a combination of principles and values, that is so compelling that the proper alternative is clear.

VI. Assess the consequences. Identify short-term, long-term, positive, and negative consequences for the major alternatives. The short-term gain or loss is often overridden when long-term consequences are considered. This step often reveals an unanticipated result of major importance.

VII. Make a decision. The consequences are balanced against one’s primary principles or values. Always double-check your decision.