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Q1) Manager at a light bulb factory wishes to find out whether there is any difference in mean life expectancy of bulbs manufactured on two different kinds of machines. Population standard deviation of machine I is 100 hours and of machine II is 115 hours. Random sample of 30 light bulbs from machine I points out a sample mean of 375 hours, and similar sample of 30 from machine II points to sample mean of 362 hours. At 5% level of significance, is there evidence of difference in mean life of bulbs made by the 2 kinds of machines. What is your conclusion?
Employees of a local university have been classified according to gender and job type. The following table provides data about the employees.
Karefree State University has an enrollment of 18,000. Researchers took a sample of 900 and found 477 students wanted a Field Hockey team. Construct the 95% and 99% Interval estimates for the population proportion.
Identify the type of sampling (random, systematic, convenience, stratified, cluster) used when a sample of people who smoke is obtained as described below.
A banks loan officer rates applicants for credit. The ratings are causally distributed with a mean of 200 also a standard deflation of 50.
A contractor developed a multiplicative time series model to predict the number of contracts in future quarters, using quarterly data on number of contracts during the 3-year period from 1996 to 1998.
At.05 level of significance, is there sufficient evidence to conclude that difference exists between proportion of cats and proportion of dogs which sleep more than 10 hours per day?
At the .01 significance level, is there a relationship between job pressure and age?
Recognize the given samples are independent samples or matched pairs.
Find a 95% confidence interval for the difference in the proportion of deaths between the streptokinase and the control group.
A review of voter registration records in a small town yielded the following table of the number of males and females registered as Democrat, Republican, or some other affiliation.
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
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