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Q1) Describe the difference between sample and a sampling distribution. Your reply must be in complete sentences and you may use sketches to help you.
Q2) In developing confidence interval estimate for population mean, which of the following is true?
a) Larger the sample standard deviation, wider will be interval estimate, all other things being equal.
b) If population standard deviation is unknown, suitable critical value must be obtained from t-distribution.
c) Confidence interval developed from smaller sample size will have larger margin of error than one obtained by using a larger sample size, all other things being equal.
d) All of the above are true.
At 0.05 level of significance, is there enough evidence to conclude that difference exists between proportion of students who have ear infections at one school and the other?
Find the mean ______________ and the standard deviation _____________
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
What is the expected number of customers that will have to wait more than 6 hours?
Sampling variability refers to the idea that different samples will include different individuals
Use the following data to write the normal equations of the linear regression between Y and X, and find the least squares regression.
Can we conclude a difference in means? YES or NO (circle one)
Suppose you bid $12000. What is the probability that your bid will be accepted?
What conclusions can you draw about the nature of the relationship between anxiety and exam performance?
Would it be reasonable to conclude that the population mean is 63 pounds?
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
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