Exhibit 10-11
An insurance company selected samples of clients under 18 years of age and over 18 and recorded the number of accidents they had in the previous year. The results are shown below.

Under Age of 18 Over Age of 18
n1 = 500 n2 = 600
Number of accidents = 180 Number of accidents = 150

We are interested in determining if the accident proportions differ between the two age groups

20.)Refer to Exhibit 10-11 and let pu represent the proportion under and po the proportion over the age of 18. The null hypothesis is
a. pu - po â?¤ 0
b. pu - po â?¥ 0
c. pu - po â? 0
d. pu - po = 0

21.)Refer to Exhibit 10-11. The pooled proportion is
a. 0.305
b. 0.300
c. 0.027
d. 0.450

22.)Refer to Exhibit 10-11. The test statistic is
a. 0.96
b. 1.96
c. 2.96
d. 3.96

Solution Summary

The solution provides answers to multiple choice questions on two sample z test for Proportion. Formula for the calculation and Interpretations of the results are also included.

True or False: The probability of Type I error is referred to as the significance level of the test.
True
False
A Type II error is defined as:
rejecting a true null hypothesis.
rejecting a false null hypothesis.
failing to reject a true null hypothesis.
f

Consider the following hypothesis test:
H0: p = .20
Ha: p (does not equal) .20
A sample of 400 provided a sampleproportion beta = 0.175.
a. Compute the value of the test statistic.
b. What is the p-value?
c. At alpha = 0.05, what is you conclusion?
d. What is the rejection rule using the critical value? What is y

A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%. The researcher gathers a random sample of 120 individuals who lives in CA and finds that the number who exercises regularly is 31 out of 120.
a. What is X2 obt?
b. What is the df

Suppose that 50% of all adult Americans believe the federal budget deficits at recent levels cause long-term harm to the nations's ecomony. What is the probability that more than 58% of a random sample of 250 adults Americans would hold this belief?
If the sample of 250 was made up of adults randomly selected from each of

It is believed that more than 50% of recovering alcoholics exhibit high levels of depression. A psychological test known as the DACL was given to a random sample of 100 recovering alcoholics, and it was found that 55 had above average depression levels. Does the sample result indicate that the proportion of recovering alcoholi

What is a test of a proportion and give an example.
What test do you use when one sample is small and the other large?
Explain the difference between testing one sample with a parameter and testing twosamples.
What are the likes and differences between the ttable and the z table?
When would you use a two pop

A market research agency would like to estimate the proportion of Canadian households owning a personal computer. What minimum sample size will be required if they want to be 99% confident that the sampleproportion will not differ from the true population proportion by more than 5%?

A claim was made that the proportion of drowning deaths in children attributable to beaches is more than 0.25 and the sample statistics include n=615 drowning deaths of children with 30% attributable to beaches. What is the value of the test statistic z?

A survey of an urban university (population 25,450) showed that 870 of 1100 students sampled supported a fee increase to fund improvements to the student recreation center. Using the 95% level of confidence, what is the confidence interval for the true proportion who support the fee increase?