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Assume that the sample is a simple random sample obtained from a normally distributed population of IQ scores of statistics professors. Use the table below to find the minimum sample size needed to be 99?% confident that the sample standard deviation s is within 50?% of σ. Is this sample size? practical?
Assuming the conditions are met (although admittedly this was not a random selection), find a 95% confidence interval for the difference in percentages.
How large would the university student population have to be in order to be regarded as effectively infinite in each of the following samples?
question 1in a certain region the mean annual salary for plumbers is 51000. letnbspxnbspbe a random variable that
weekly commodity prices for heating oil in cents were obtained for a period of 30 weeks and regresses against time.
206 randomly selected light bulbs were tested in a laboratory, 161 lasted more than 500 hours. Find a point estimate of the proportion of all light bulbs that last more than 500 hours.
For this study, r2 .10, meaning that psychotherapy could account for only 10% of the variability in results. Are you impressed with the results?
Identify the fallacies of relevance committed by the following arguments, giving a brief explanation for your answer. If no fallacy is committed, write "no fallacy."
a sample survey at a super market showed that 204 of 300 shoppers regularly use coupons. use the large- sample
to compute the variance what should one do?a. square the standard deviation.b. take the square root of the standard
Now, find the probablity distribution for the number of earthquakes in a randomly selected year (round to four decimal places):
Determine a 95% confidence interval for the mean efficiency of a given batch of motors. If we want to cut the confidence interval by 1/3, how many motors should be tested?
Create a histogram for the number of words in the 600 randomly selected sentences.- Provide a summary of the dataset based on your histogram.
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