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Many elementary school students in a school district currently have ear infections. A random sample of children in two different schools found that 15 of 44 at one school and 16 of 30 at the other had this infection. At the .05 level of significance, is there sufficient evidence to conclude that a difference exists between the proportion of students who have ear infections at one school and the other?
What is the probability that a randomly selected person will be a Protestant and at the sametime be a Democrat or a Republican and what proportion of teenagers watch 16 to 18 hours of TV a week?
The margin of error for a sample size 25 is +-3. Will the margin of error be greater or less if the sample size is 400? What is the new margin of error?
in a suburban area past records revealed that 50 percent of all the high school graduates go to college. from 20
an engine additive is being tested to see whether it can effectively increase gas mileage for a number of vehicles.
If an individual from this age group is selected, find the probability that his or her blood pressure will be between 70 and 95. Assume normal distribution.
a school has three tenth grade classes. all three classes took the same physics test. the mean score for the three
suppose that a random variable x has the uniform distribution on the interval 01. determine the p.d.f. of a x2 b -x3
Faced with rising fax costs, a firm issued a guideline those transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below.
Carry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
What is the standard error of measurement for the test? What range of scores would you expect an individual who made 54 on the test to make on another test of similar difficulty? Assume you want to be 68% accurate in your estimate.
The rest have no opinion. " Suppose that a a sample of 100 American adults is quizzed on the subject. What is the probability of the following events?
an io psychologist asks employees to complete surveys measuring job satisfaction and organizational citizenship
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