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Every student taking elementary statistics at a large university (about 1,100 students) participated in a class project by rolling a 6-sided die 100 times. Each individual student determined the proportion of his or her 100 rolls for which the result was a "1". The instructor plans to draw a histogram of the 1,100 sample proportions. What will be the approximate mean for the 1,100 sample proportions?
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
Events A and B are mutually exclusive events defined on common sample space. If P (A) 0.5 and P (A or B) = 0.70, determine P (B).
Perform a chi-square test on the following data:
Derive the probability distribution of the completion times - For each of the distribution in (i) above, calculate their relevant statistics. A task is known to have the following time to completion
In what height interval must the company expect to determine middle 70% of kindergarteners?
We are interested in determining whether or not the opinions of the individuals (as to Yes, No, and No Opinion) are uniformly distributed.
would this prove that they are exceeding their goal, using = .025?
If an apartment is selected at random, what is the probability that it is not a 2 bedroom apartment on the 2nd floor?
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
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. The upper and lower control limits, respectively, for an:
Suppose Abraham Lincoln had answered a survey questionnaire in which he indicated that he had not received a grade school diploma. The researcher found that Lincoln's educational score did not correlate with the expected variables. What was wrong?
Below you are given a partial computer output based on a sample of 16 observations.
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