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Question: Write the null and alternative hypotheses for each of the following examples. Determine if each is a case of a two-tailed, a left-tailed, or a right-tailed test.
a. To test if the mean number of hours spent working per week by college students who hold jobs is different from 20 hours.
b. To test whether or not a bank's ATM is out of service for an average of more than 10 hours per month.
c. To test if the mean length of experience of airport security guards is different from 3 years.
d. To test if the mean credit card debt of college seniors is less than $1000.
e. To test if the mean time a customer has to wait on the phone to speak to a representative of a mailorder company about unsatisfactory service is more than 12 minutes.
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
prepare a box-and-whisker plot for the following data.11 8 26 31 62 19 7 3 14 7533 30 42 15 18 23 29 13 16 6does this
Use the binomial distribution in the Data Analysis add - in to simulate the distribution of men and women among the next ten arrivals at an emergency room, assuming that, on average, six people out of ten who arrive are men.
At 95% confidence using the critical value approach, determine if the proportion of females in the company is significantly less than 50%.
Identify the following dilemmas as either constructive or destructive.- If psychotherapists respect their clients' right to confidentiality, then they will not report child abusers to the authorities;
a certain brand of candies have a mean weight of 0.8616g and a standard deviation of 0.0518 based on the sample of a
Avalon Bakery would like you to recommend how many loaves of its rye bread to bake at the beginning of each day. Each loaf costs the bakery $3.00 and can be sold for $6.00.
Using the 0.05 level of signifi- cance in a two-tail test, examine whether the percentage of sample homes having a fireplace could have differed from 62% simply by chance. Determine and interpret the p-value for the test.
Four students each received a raw score of 22 on a different test. Compute the z-score for the raw score value of 22 for each student, given information about the distributions of X values for each test.
You can be 95% confident that the mean salary for all quality managers with at least 20 years of experience is between what two numbers?
1 the average score for male golfers is 95 and the average score for female golfers is 106 golf digest april 2006.
In the five number summary for men, the minimum height was 17 inches, an obvious outlier. What is a possible reason for this outlier, and what should the instructor do about it?
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