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What hypothesis testing procedure would you use in the following situations? Explain your reasons, including assumptions and limitations for selecting the procedure.
A test classifies applicants as accepted or rejected. Based on 200 applicants, test the hypothesis that ad placement success is not related to gender.
A company manufactures and markets automobiles in two different countries. You want to know if the gas mileage is the same for vehicles from both facilities. There are samples of 45 units from each facility.
During the past six months, 73.2% of US households purchased sugar. Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10. 80% of the households spent more than what amount?
A battery manufacturer advertises the average life of its automobile battery is 60 months.what % of batteries should last between 50 and 70 months? The standard deviation is 10 months.
The average number of typos on one page of a manuscript is 8. What is the probability that 4 to 6 type appear on 2 pages of the manuscript? Imagine Poisson distribution.
Briefly explain how the standard deviation influences outcome of hypothesis test. How does σ influence measures of effect size?
Are the data sufficient to that the herb has a significant effect on memory? Use a two-tailed test with α = .05.
If sample of size 10 packages is randomly chosen, and 5 percent rate holds, determine the probability that exactly 2 packages in the sample arrive late?
A journal polled its readers to determine the proportion of wives who, if given a second chance, would marry their husband again.
The travel time for a college student traveling between her home and her college is uniformly distributed between 40 and 90 minutes.
Provide at least five real life examples where legislation and daily life choices have been driven by what could be defined basically as rooted in statistical correlations and regression analyses.
A recent survey reported in Business Week dealt with the salaries of CEOs at large corporations and whether company shareholders made money or lost money.
When the underlying average of a time series is very stable and there is no trend, cyclical, or seasonal influences,
Calculate the 95% confidence interval for the rate of positive tuberculin reaction separately for each of the two subpopulation, those with high exposure and those with low exposure.
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