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A bowler who has averaged 196 pins in the past year is asked to experiment with a ball made of a new kind of material. If he rolls 25 games with the new ball, averaging 204 pins with a standard deviation of 24.9, can one conclude at a level of significance of .01 that the new ball has improved his game?
a) Direction = UPPER TAILED/LOWER TAILED/2-TAILED (circle one)
b) P-value = ________________
c) REJECT THE NULL or DO NOT REJECT THE NULL? (Circle one)
d) Can we conclude the ball improved his game? YES or NO (circle one)
Determine probability of generating six digits and getting code consisting of 1, 2, 3, ..., 6 if each digit can be repeated?
How strong is the evidence against the company's claim? Based on these data, the P -value of the appropriate test
What kind of statistical test best did you use?
The chi-square goodness of fit is______________a one-tailed test with the rejection region in the right tail.
The 99% confidence interval estimate for a population variance when a sample standard deviation of 12 is obtained from a sample of 10 items is:
Plot stem-and-leaf plot and boxplot for Mtotal. Illustrate hand calculation of median location and upper hinge location of boxplot, and determine their corresponding data values.
How large a sample is required if the 97 percent level of confidence is used and the estimate is to be within $2,500? The standard deviation is $16,000.
The data below show the average daily high temperature for Chicago, Illinois, for twelve recent spring and summer months. Create a stem-and -leaf diagram for the data.
Compute z values for each and comment on your findings.
Using the .05 level of significance: a) Is there a difference among types of gasoline? b) Is there a difference in the cars?
Make use of normal probability distribution features of EXCEL to help determine the probability.
For this same sample of n = 45, find out the width of confidence interval around population mean? Illustrate all work.
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