Question 1

10 Points

In hypothesis testing, the assumption(s) for the Z test for a Mean when the is known

a. The sample is a random sample

b. Either n > or = 25 or the population is normally distributed if n < 25

c. both a) and b)

d. none of the above

Question 2

5 Points

When the value of is increased, the probability of committing a Type I error is

a. Decreased

b. Increased

c. The same

d. None of the above

Question 3

10 Points

The average expenditure per student (based on average daily attendance) for a certain school year was $10,337 with a population standard deviation of $1560. A survey for the next school year of 150 randomly selected students resulted in a sample mean of $10, 798. Find the Z statistics? Should the null hypothesis be rejected at alpha = .05 level of significance?

Question 4

5 Points

The average age of attorneys is greater than 25.6 years

a. Ho: = 25.6 ;HA: not = 25.6

b. Ho: = 25.6 ;HA: > = 25.6

c. Ho: = 25.6 ;HA: < 25.6

d. None of the above

Question 5

10 Points

For the t test , one uses ----------------instead of

a. n

b. s

c.

d. t

Question 6

10 Points

The average expenditure per student (based on average daily attendance) for a certain school year was $10,337 with a population standard deviation of $1560. A survey for the next school year of 150 randomly selected students resulted in a sample mean of $10, 798. Find the 95% confidence level? Should the null hypothesis be rejected?

Question 7

10 Points

List and explain the steps in hypothesis testing

Question 8

5 Points

If you wish to test the claim that the mean of the population is 100, the appropriate null hypothesis is

a.x = 100

b. 100

c. =100

d. 100

Question 9

5 Points

The average age of community college students is 24.6 years. State the null and alternative hypothesis

a. Ho: = 24.6 ;HA: not = 24.6

b. Ho: = 24.6 ;HA: > 24.6

c. Ho: = 24.6 ;HA: < 24.6

d. None of the above

Question 10

5 Points

In hypothesis testing, the p-value is the probability of obtaining a test statistics when

a. The null hypothesis is true

b. The null hypothesis is false

c. Either the alternative hypothesis is true or false

d. None of the above

Question 11

10 Points

The average expenditure per student (based on average daily attendance) for a certain school year was $10,337 with a population standard deviation of $1560. A survey for the next school year of 150 randomly selected students resulted in a sample mean of $10, 798. Find the P-value? Should the null hypothesis be rejected at alpha = .05 level of significance?

Question 12

10 Points

Using the Z table, find the critical value for

a) = .05, two-tailed test

b) = .01, two tailed test

c) = .10, two-tailed test

Question 13

5 Points

The average pulse rate of male marathon runners is less than 70 beats per minute

a. Ho: = 70 ;HA: not = 70

b. Ho: = 70 ;HA: < 70

c. Ho: = 70 ;HA: > = 70

d. None of the above