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Q1) ATM machine was installed at Hunter Industries for exclusive use of Hunter's employees.
Union Bank desired to evaluate percentage of all employees which used the machine at least twice in last month. From a arbitrarily chosen sample of 100 employees, 45 did use ATM at least twice. Use this information to make a 95% confidence interval evaluating percentage of all employees that use machine at least twice per month.
Q2) Assume you are interested in evaluating proportion of San Diegans between ages of 18 and 40 who are able to buy a home in San Diego metropolitan area, where median home price just reached $716,000. You would like to evaluate the proportion with 90% confidence and margin of error of 3%. How many San Diegans between 18 and 40 years old would you require to arbitrarily sample to evaluate this correctly?
Q3) Office manager for large company is studying usage of its copier machines. Random sample of 6 of its machines revealed the following number of copies made in one day: 826 931 1,126 918 1,011 and 1,124. Use this information to make a 95% confidence interval to evaluate true average number of copies made each day at this company.
Problems on Sampling Variability and Standard Error and Confidence Intervals
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
Number of miles flown in a One- year period by the sample of "frequent flyers" was recorded. Is this a grouped or an ungrouped frequency distribution?
Give a possible description why serum cholesterol values for older males are lower than for younger males and reverse is true for females.
Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention.
Find the critical F value for the Following,
Suppose it costs $25 per student for the administrators to provide the course materials.
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
Complete the table and answer the following questions. Use the .05 significance level.
The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
Create the 90% confidence interval for mean score of all such subjects. You may suppose scores are usually distributed.
Create a 99 percent confidence interval for mean daily intake of milk. You may suppose daily intake amounts are usually distributed.
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