In testing H0: = 23 versus HA: > 23 when =26, s = 6, and n = 20, what is the value of the t-statistic?

A. 10.00

B. 2.24

C. -2.24

D. 1.34

In testing H0: p = .2 versus HA: p .2 with P = .26 and n = 100, what is the value of the

z-statistic?

A. 1.50

B. 1.33

C. -1.50

D. -1.33

When we test H0: p1- p2 .01, HA: p1 - p2 > .01 at a = .05 where P1 = .08, P2 = .035, n1= 200, n2 = 400, what is the standard deviation used in the calculation of the test statistic?

A. 0.0005

B. 0.3277

C. 0.0213

D. 0.0134

When we test H0: p1- p2 .01, HA: p1 - p2 > .01 at a = .01 where P1 = .08, P2 = .053, n1= 200, n2 = 400, what is the standard deviation used in the calculation of the test statistic?

A. 0.0222

B. 0.0213

C. 0.0134

D. 0.0178

If we are testing the difference between the means of two normally distributed independent populations with samples of n1 = 10, n2 = 10, the degrees of freedom for the t statistic is ____.

A. 19

B. 18

C. 9

D. 8

E. 20

Determine the p-value for H0: p = .5 versus HA: p .5 when n = 225 and P = .54.

A. .1131

B. .2262

C. .0164

D. .0082

Determine the p-value for H0: p = 0.5 versus HA: p < 0.5 when n = 225 and P = .52.

A. 0.6262

B. 0.1151

C. 0.7257

D. 0.8849

Determine the p-value for H0: p .5 versus HA: p > .5 when n = 225 and P = .54.

A. .1131

B. .2262

C. .0082

D. .8869

In testing H0: = 3 versus Ha: not equal to 3, when X = 3.15, o = 1.5, and n = 100, what is the p-value?

A. 0.0655

B. 0.0456

C. 0.0228

D. 0.3174

In testing H0: = 3 versus Ha: not equal to 3, when X = 3.15, o = 1.5, and n = 100, what is the value of the z-statistic?

A. 1

B. 2

C. 3

D. None of the other

We are interested in testing the following hypotheses. H0: P1-P2 0 Ha:P1-P2>0. The level of significance is set to 0.01. The critical value for this test is

A. 2.576

B. More information is needed

C. 2.33

D. 1.985

A cereal manufacturer is concerned that the boxes of cereal not be under filled or overfilled. Each box of cereal is supposed to contain 13 ounces of cereal.A random sample of 36 boxes is tested. The sample average weight is 12.85 ounces and the sample standard deviation is 0.75 ounces. Use the critical-value approach to test whether the population average weight of a cereal box differs from 13 ounces. The test statistics should be:

A. -1.20

B. -2.576

C. -2.35

D. -3.36

A cereal manufacturer is concerned that the boxes of cereal not be under filled or overfilled. Each box of cereal is supposed to contain 13 ounces of cereal.A random sample of 36 boxes is tested. The sample average weight is 12.85 ounces and the sample standard deviation is 0.75 ounces. Use the critical-value approach to test whether the population average weight of a cereal box differs from 13 ounces. The critical-value should be:

A. +/ -1.96

B. +/ -1.645

C. None of the other

D. +/ -2.576

In testing H0: = 3 versus Ha: not equal to 3, when X = 3.15, o = 1.5, and n = 100, what is your decision at the 5% significance level?

A. Fail to reject the null

B. None of the other

C. Accept the alternative

D. Reject the null

One survey conducted by a major leasing company determined that the Lexus is the favorite luxury car for 25% of leases in Atlanta. Suppose a US car manufacturer conducts its own survey in an effort to determine if this figure is correct. Of the 384 leases in Atlanta surveyed, 79 lease a Lexus. Calculate a confidence interval that tests the hypotheses at a= .03

A. [.142, 269]

B. [.177, .234]

C. [.161, .251]

D. [.158, .254]