Question

1- In a study done by Statistics Weekly, they found that 12% of people believe that there will eventually be a zombie apocalypse. Suppose we have a random sample of 500, would it be unusual to find 43 people who believe that there will eventually be a zombie apocalypse. Would it be unusual to find 70 people who believe that there will eventually be a zombie apocalypse?

2-The age at the time of marriage was obtained for a random sample of 10 women. The results were 28, 24, 22, 25, 33, 35, 27, 26, 27, 20. Assume that the population has a normal distribution. Find a 90% confidence interval for the mean age at which a woman marries. Interpret your answer.

3- A study conducted at a certain college shows that 54% of the school’s graduates move to a different state after graduating. Find the probability that among 7 randomly selected graduates, at least one moves to a different state after graduating.

4- If a flight is on time 90% of the time, use a normal approximation to the binomial to find the probability that between 175 and 190 out of a total of 200 flights will be on time.

Answer #1

1 ) In a study done by Statistics Weekly, they found that 12% of
people believe that there will eventually be a zombie apocalypse.
Suppose we have a random sample of 500, would it be unusual to find
43 people who believe that there will eventually be a zombie
apocalypse. Would it be unusual to find 70 people who believe that
there will eventually be a zombie apocalypse?
2)-If a flight is on time 90% of the time, use a...

QUESTION # 1
Most exhibition shows open in the morning and close in the late
evening. A study of Saturday arrival times showed that the average
arrival time was 3 hours and 48 minutes after the doors opened, and
the standard deviation was estimated at about 58 minutes. Assume
that the arrival times follow a normal distribution.
(a) At what time after the doors open will 87% of the people who
are coming to the Saturday show have arrived? Round...

1. Business Weekly conducted a survey of graduates from 30 top
MBA programs. On the basis of the survey, assume the mean annual
salary for graduates 10 years after graduation is 162000 dollars.
Assume the standard deviation is 31000 dollars. Suppose you take a
simple random sample of 70 graduates.
Find the probability that a single randomly selected policy has a
mean value between 153848.5 and 170892.5 dollars.
P(153848.5 < X < 170892.5)
= (Enter your answers as numbers accurate to...

A study was done to investigate what people think is "creepy."
Each person in a sample of women and a sample of men were asked to
do the following.
Imagine a close friend of yours whose judgment you trust. Now
imagine that this friend tells you that she or he just met someone
for the first time and tells you that the person was creepy.
The people in the samples were then asked whether they thought
the creepy person was...

A Pew Research study conducted in 2017 found that approximately
75% of Americans believe that robots and computers might one day do
many of the jobs currently done by people.† Suppose we have the
following data collected from nurses, tax auditors, and fast-food
workers in which a higher score means the person feels his or her
job is more likely to be automated.
Nurse
Tax
Auditor
Fast-Food
Worker
4
4
5
4
5
7
5
5
6
2
3
7...

1. Find the area under the standard normal curve (round to four
decimal places)
a. To the left of z=1.65
b. To the right of z = 0.54
c. Between z = -2.05 and z = 1.05
2. Find the z-score that has an area of 0.23 to its right.
3. The average height of a certain group of children is 49
inches with a standard deviation of 3 inches. If the heights are
normally distributed, find the probability that a...

(Case evaluation, Questions 26-39)
In a study, the researchers were interested in seeing whether if
Ariana Grande’s music can be sexually stimulating to men. The
researchers decided to include male students from Hunter College,
age ranging from 18-20, without pre-diagnosed sexual dysfunctions.
Out of the possible N=10,538 students who meet the criteria for
participation, 200 men were randomly selected by computer to
participate. After having the participants sign the informed
consent, the researchers randomly assigned these subjects into 4...

1. Suppose that the time it takes you to drive to work is a
normally distributed random variable with a mean of 20 minutes and
a standard deviation of 4 minutes.
a. the probability that a randomly selected trip to work will
take more than 30 minutes equals: (5 pts)
b. the expected value of the time it takes you to get to work
is: (4 pts)
c. If you start work at 8am, what time should you leave your...

Question 11 (1 point)
A suggestion is made that the proportion of people who have food
allergies and/or sensitivities is 0.48. You believe that the
proportion is actually less than 0.48. The hypotheses for this test
are Null Hypothesis: p ≥ 0.48, Alternative Hypothesis: p < 0.48.
If you select a random sample of 28 people and 12 have a food
allergy and/or sensitivity, what is your test statistic and
p-value?
Question 11 options:
1)
Test Statistic: 0.545, P-Value: 0.293...

Question 1 2 pts
Let x represent the height of first graders in a class. This
would be considered what type of variable:
Nonsensical
Lagging
Continuous
Discrete
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Question 2 2 pts
Let x represent the height of corn in Oklahoma. This would be
considered what type of variable:
Discrete
Inferential
Distributed
Continuous
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Question 3 2 pts
Consider the following table.
Age Group
Frequency
18-29
9831
30-39
7845
40-49
6869
50-59
6323
60-69
5410
70...

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