FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 9: Hypothesis Tests

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 21

Essay

Review LaterAdd Note

Review Later

A law enforcement agent believes that at least 88% of the drivers stopped for speeding on Saturday nights are under the influence of alcohol.A sample of 66 drivers who were stopped for speeding on a Saturday night was taken.Eighty percent of the drivers in the sample were under the influence of alcohol. a. State the null and alternative hypotheses. b. Compute the test statistic. c. Using the p-value approach, test the hypotheses at the .05 level of significance.

Correct Answer

verified

​
a.
H₀: p .88
H_a: p ...

View Answer

Show Answer

Question 22

Multiple Choice

Review LaterAdd Note

Review Later

In the hypothesis testing procedure, α is the

A) level of significance.
B) critical value.
C) confidence level.
D) p-value.

E) C) and D)
F) A) and B)

Correct Answer

verified

Show Answer

Question 23

Multiple Choice

Review LaterAdd Note

The power curve provides the probability of

Consider the following hypothesis test: H₀: μ = 10 H_a: μ ≠ 10 A sample of 81 provides a sample mean of 9.5 and a sample standard deviation of 1.8. a. Determine the standard error of the mean. b. Compute the value of the test statistic. c. Determine the p-value; and at the 5% level, test the above hypotheses.

In a two-tailed hypothesis test situation, the test statistic is determined to be t = -2.032.The sample size is 35.The p-value for this test is

A sample of 30 cookies is taken to test the claim that each cookie contains at least 9 chocolate chips.The average number of chocolate chips per cookie in the sample was 7.8 with a standard deviation of 3. a. State the null and alternative hypotheses. b. Using the critical value approach, test the hypotheses at the 5% level of significance. c. Using the p-value approach, test the hypotheses at the 5% level of significance. d. Compute the probability of a Type II error if the true number of chocolate chips per cookie is 8.

As the test statistic becomes larger, the p-value

A sample of 81 account balances of a credit company showed an average balance of $1200 with a standard deviation of $126. a. Formulate the hypotheses that can be used to determine whether the mean of all account balances is significantly different from $1150. b. Compute the test statistic. c. Using the p-value approach, what is your conclusion? Let α = .05.

In order to determine the average price of hotel rooms in Atlanta, a sample of 64 hotels was selected.It was determined that the average price of the rooms in the sample was $108.50 with a standard deviation of $16. a. Formulate the hypotheses to determine whether or not the average room price is significantly different from $112. b. Compute the test statistic. c. Using the p-value approach, test the hypotheses.Let α = .1.

Read the z statistic from the normal distribution table and choose the correct answer.For a one-tailed test (lower tail) using α = .0901, z =

Confirmed cases of West Nile virus in birds for a sample of six counties in the state of Georgia are shown below.Assume the population is normally distributed. ​ We are interested in testing the following hypotheses regarding these data: ​ H₀: μ 3 H_a: μ > 3 a. Compute the mean and the standard deviation of the sample. b. Compute the standard error of the mean. c. Determine the test statistic. d. Determine the p-value; and using α = .10, test the hypotheses.What is your conclusion?

​When the null hypothesis is not rejected, it is​

In hypothesis testing, the tentative assumption about the population parameter is

For a lower tail test, the test statistic z is determined to be zero.The p-value for this test is

If the null hypothesis is rejected at the 5% level of significance, it _____ at the 1% level.

When the p-value is used for hypothesis testing, the null hypothesis is rejected if

​In hypothesis testing, the critical value is

The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles.Management believes that due to a new production process, the life expectancy of their tires has increased.In order to test the validity of their belief, the correct set of hypotheses is

Read the t statistic from the t distribution table and choose the correct answer.For a two-tailed test with a sample size of 20 and using α = .20, t =

A grocery store has an average sales of $8000 per day.The store introduced several advertising campaigns in order to increase sales.To determine whether or not the advertising campaigns have been effective in increasing sales, a sample of 100 days of sales was selected.It was found that the average was $8200 per day.From past information, it is known that the standard deviation of the population is $1500.The value of the test statistic is