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1. You are given the sample mean and the sample standard deviation. use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider?
A random sample of 32 gas grills has a mean price of $630.90 and a standard deviation of $56.70.
A random sample of 156 fields of durum wheat has a mean yield of 26.8 bushels per acre and standard deviation of 8.0 bushels per acre
2. Find the critical value Zc necessary to form a confidence interval at the given level of confidence. c = 0.80 c = 0.85 c =0.97 c = 0.75
Testing equality of variances - evidence of a difference in the variability of monthly talking time on cell phones for men and women?
Given that Z is a standard normal random variable. What is the value of Z if the area to the left of Z is 0.9382?
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..
Assume the observed value of the test statistic is 1.53. What is the smallest level for which there is sufficient evidence to reject H 0 (i.e. the p-value for this test)?
If we fit the least-squares line to the 12 data points (one for each month) we obtain the following results from a software package. Notice that temperature is taken as the explanatory variable and crawling age as the response.
Do you think this statement has any merit? Why or why not? Explain why the manager may have said it and then further substantiate his argument or compose a rebuttal.
Based on the equation of the least-squares line, we use software to predict the average number of home runs hit per game per team for the year 2001. We obtain the following.
A permutation resample for a two-sample test
Take a deck of cards. A deeck has 52 cards with two major colors(Red and Black), with 26 cards each. Red colors comes in two shapes(heart and diamond)
Extrapolating this data by using the sum of squares method would further reveal any discretionary variances in relationship to the mean?
He (given that) the true proportion of perfect condition items is only 80% what is the probability that the lot will not be shipped?
If the mailing list can be considered a random sample of the population, what is the chance that at least 1245 Macintosh users will receive the flyer?
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