multiple choice

1.Find the critical z values. Assume that the normal distribution applies.

Left-tailed test; =0.04

a.z = - 1.645

b.z = 1.645

c.z = 1.75

d.z = - 1.75

2.Use the given information to find theP-value.

The test statistic in aright-tailed test is z=1.36.

a.P-value = 0.9484

b.P-value = 0.0968

c.P-value = 0.0869

d.P-value = 0.9131

3. Bill Alther is a zoologist who studies Anna's hummingbird (Calypte anna; Reference:Hummingbirdsby K. Long and W. Alther). Suppose that in a remote part of the Grand Canyon, a random sample of six of these birds was caught, weighed, and released. The weights (in grams) were

3.7

2.9

3.8

4.2

4.8

3.1

4.The sample mean is. Letxbe a random variable representing weights of Anna's hummingbirds in this part of the Grand Canyon. We assume thatxhas a normal distribution and. It is known that for the population of all Anna's hummingbirds, the mean weight is.

Determine whether the data indicate that the mean weight of these birds in this part of the Grand Canyon is less than4.55grams. Use.

What is the test statistic?

a.z = -3.75

b.z = - 2.80

c.z = -2.33

d.z = 0.23

5.for Question 4... The type of test to be performed is a ______________ test

two - tail

left - tail

right - tail

6.

For Question 10.... What is the final conclusion?

a.Reject the null hypothesis, . There isnot sufficient evidence to warrant rejection of the claim that the mean weight of the birds is less than 4.55 g.

b.Fail to Reject the null hypothesis, . There isnot sufficient evidence to warrant rejection of the claim that the mean weight of the birds is less than 4.55 g.

c.Reject the null hypothesis, . There issufficient evidence to warrant rejection of the claim that the mean weight of the birds is less than 4.55 g.

d.Fail to Reject the null hypothesis, . There is sufficient evidence to warrant rejection of the claim that the mean weight of the birds is less than 4.55 g.