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Jane chooses every 20th person in the campus phone book to call for her interview study. Justin identifies important subgroups in the campus population, then selects participants so that his sample had the same proportions of each important group, as the population does. What type of sampling occurs?
Explain the distribution of mean of samples of size 15.
The estimated salary range is $4,500, the margin of error should be $100 and the desired level of confidence is 95%.
If you select a random sample of 16 cups and are willing to have an α = 0.05 risk of committing a Type I error, compute the probability of a Type II error (β) if the population mean amount dispensed is actually:
Compare your best difference to the result from an ordinary two-sample t-test between these groups. Comment the difference.
Draw a sketch of the standard normal distribution curves, one for the current process and another one for the recentered process. Label the spec limits and shade the area of the curve that corresponds to your answer.
You run a two tail t-test. The critical value for this test at the .05 level is a t of 7.82. What value must the obtained t-test statistic be in order to be considered significant at the .05 level?
Using a 5% level of significance, can we say that, generally there is important difference between satisfaction levels of mid country residents and coastal residents?
Sketch a curve, point out the distribution (i.e., normal , student T, Chi square), critical region(s). test statistics, critical values(s) and n p-value?
Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10.
Using the 0.95 degree of confidence, what is the interval estimate for the population proportion (to the nearest tenth of a percent)?
When using past data, I have found that the proportion of items rejected by quality control personnel is about 3%. We normally make 5000 items per day. For a p chart, what are the upper and lower control limits?
Do the data indicate that the sleeping pill is effective at a 1% level of significance?
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