# Assume that on the third exam in a calculus course, the average score over the years has been 72 with a standard deviation 12.You are currently taking the course and there are 25 students in the class?

05 / 03 / 2018 Assignment

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1. Given the following sample of 10 high
temperatures from March:55, 60, 57, 43,
59, 66, 72, 65, 59, 47.

1. Determine
the mean.

2. Determine the median.

3. Determine the mode.

4. Describe the shape of the distribution.

5. Determine Q1, Q2, Q3 and IQR.

1. The contingency table shows classification of
students in a Statistics class.

 From NJ From PA GPA at least 3.0 15 5 20 GPA below 3.0 45 35 80 60 40 100
1. If a student is selected at random, what is the
probability that he/she is from NJ?

2. If a student is selected at random, what is the
probability that he/she has a GPA below 3.0?

3. If we know that the student is from PA, what is
the probability that he/she has a GPA of at least 3.0?

4. If a student is selected at random, what is the
probability that he/she is from NJ and has a GPA below 3.0.

5. If a student is selected at random, what is the
probability that he/she from PA and has GPA of at least 3.0.

1. Your friend is applying for 4 jobs.The hourly pay rate for the 4 jobs are, \$8,
\$12, \$15, \$20.The probability
distribution below shows the probability of getting each of these jobs:

 Job Pay Rate,X Probability, P(X) 8 .30 12 .20 15 .40 20 .10
1. What is the probability that your friend will
get a job paying at least \$15/hour?

2. What is the expected pay rate for your friend?

1. It is known that 31% of cars are considered gas
hogs (i.e. they give less than 15 mpg).
If we select 20 cars at random:

1. What is the probability that exactly 4 will be
gas hogs?

2. What is the probability the at least 4 but not
more than 7 will be gas hogs?

3. How many cars are most likely to be gas hogs?

2. You ask all 200 students at school how much
money they have in their pockets.The
amount ranges from \$0 to \$130.You determine
the mean to be \$56.40 with standard deviation of \$8.40.You believe that the amount is normally
distributed.

1. If you pick a person at random, what is the
probability that he/she has at least \$45?

2. What percentage of the students will have
between \$40 and \$50 in their pockets.

3. If you pick a person at random, what is the
probability that he/she has either less than \$30 or more than \$70.

4. Approximately how many people in the class do
you expect to have at least \$65?

5. We want to identify the students with top 10.5%
amounts as “rich”.What is the minimum
dollar amount the students in this group would need in their pockets.

3. Assume that on the third exam in a calculus
course, the average score over the years has been 72 with a standard deviation
12.You are currently taking the course
and there are 25 students in the class?

1. What is the probability that
the mean score for your class will be greater than 75?

2. What is the probability that
the mean score for your class will be between 68 and 70?

1. A sample of 25 days in summer yields an average
high temperature of 80 with a standard deviation of 12.

1. Give a point estimate of the true mean of the
high temperature.

2. Find a 99% confidence interval for the average
high temperature for the summer.

3. How big a sample do we need if we want to be 90%
confident of being within 7 degrees of the population mean?

2. A sample of 100 exams yielded an average grade
of 82 and standard deviation of 14.Find
a 95% confidence interval for the average exam grade.

3. Heights of aliens from Mars are known to be
normally distributed with a population standard deviation of 9 inches.How big a sample do we need to take if we
want be 95% confident that our error will not exceed 3 inches?

4. Preliminary studies have shown that 20% of the
voters might be willing to vote for Sran for President.

1. Construct a 90% confidence interval for the
proportion of voters who would be willing to support Sran.

2. Before entering the race, Sran would like to conduct
a poll to check his level of support.How
big should be the sample be if he wants to be 95% sure that the error is no
more than 2%?

5. The average weight of men joining a gym has
historically been 170 pounds with a standard deviation of 27.The owner feels that the average weight has
now decreased to less than 165 pounds.
To support his claim, the owner conducts a sample of 25 men and finds
their average to be 153.He would like
to use a significance level of .05 to test his claim.

1. State the null hypothesis.

2. State the alternate hypothesis.

3. Will you use z or t distribution for this
problem?

4. Is this a two-tail test or a one-tail test?Draw a normal curve representing the problem.

5. Determine the critical value.

6. Determine the rejection region.

7. Calculate the test statistic.

8. Would you accept or reject the owner’s
claim?Explain.

6. The average score on a certain college entrance
test has been known to be 240.The dean
of a university feels that this has changed.
He conducts a sample of 25 students to test his claim.The sample yields an average of 232 with a
standard deviation of 25. He would like to use a significance level of .10.

1. State the null hypothesis.

2. State the alternate hypothesis.

3. Will you use z or t distribution for this
problem?

4. Is this a two-tail test or a one-tail test?Draw a normal curve representing the problem.

5. Determine the critical value.

6. Determine the rejection region.

7. Calculate the test statistic.

8. Would you accept or reject the dean’s claim?

7. A presidential candidate states that she
currently has exactly 30% of the vote.A
newspaper thinks that this number is inaccurate.So it conducts a sample 500 voters and finds 175
people support the candidate.The
newspaper would like to test its claim using .05 significance level.

1. State the null hypothesis.

2. State the alternate hypothesis.

3. Will you use z or t distribution for this
problem?

4. Is this a two-tail test or a one-tail test?Draw a normal curve representing the problem.

5. Determine the critical value.

6. Determine the rejection region.

7. Calculate the test statistic.

8. Would you accept or reject the newspaper’s
claim?

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