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Q1) In past, percent of smokers able to give up smoking "cold turkey" was reported to be no more than 0.10. If we wanted to make new estimate of that percent that now were able to give up "cold turkey" with precision (margin of error ) of plus and minus 0.02 and with 99% confidence, how large sample would be required? What sample size would be needed to make that evaluated within plus and minus 0.03 and with 95% confidence?
Q2) Job training program trained thousands of participants. After training was completed, random sample of 64 of these participants illustrated that only eight had retained jobs in which they were placed for more than three months. If we wanted to evaluate the percentage of trainees retaining jobs for more than three months (suppose that 64 comprised random sample of all trainees) with 95% confidence, what would that evaluation be and what is the margin of error?
Ten students were sampled at random from a student population. Each was asked how many courses he or she was planning on studying in the upcoming year. The following is a list of the reported data values: 1, 2, 2, 3, 4, 5, 5, 5, 5, 6 What is the vari..
P-value to test hypotheses,
A survey of college students collected information on several variables: Distance from Home, Age, Major, Gender, and Class. The variable Major is
If one person is selected at random, what is the probability that person is Female?
A bank wants to get new customers for their credit card. They try two different approaches in their marketing campaign. The first promises a "cash back" reward; the second promises low interest rates. A sample of 500 people are mailed the first br..
A major study examined the relationship between cause of death (heart attack, cancer, stroke, accident, etc.) and age. A good way to graphically represent the relationship is with
If level of significance ( α ) is 0.005 in two-tail test, how large is non rejection region under curve of the t distribution?
Compute β-error of test in part (a) if true difference in mean burning rate is 2.5 centimeters per second.
To determine if this is evidence that students perform worse under uncomfortable conditions, The P-value of a test
Set up null hypothesis for associated F test.
Compute an F-statistic for each linear construct and determine its significance.
Create a 90% confidence interval for proportion of all kernels that would not pop.
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