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To test whether the mean length is signficantly less than a given value.
During recent seasons, Major League Baseball has been criticized for the length of the games. A report indicated that the average game lasts 3 hours and 30 minutes. A sample of 17 games revealed the following times to completion. (Note that the minutes have been changed to fractions of hours, so that a game that lasted 2 hours and 24 minutes is reported at 2.40 hours.
2.98
2.4
2.7
2.25
3.23
3.17
2.93
3.18
2.8
2.38
3.75
3.2
3.27
2.52
2.58
4.45
2.45
Can we conclude that the mean time for a game is less than 3.50 hours? Use the .05 significance level.
Calculate a 92% confidence interval for the mean density of quartz porphyry, given that 75 samples yield mean of 2.62 grams per cubic centimeter
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
Calculate the mean number and median number of apples in a bag.
The sample data are summarized by the statistics n = 27, x = 4.6 years, s- 1.9 years.
(a) Use the steps of hypothesis testing, (b) figure the effect size for the study; and (c) explain your answers to (a) and (b) to someone who has never had a course in statistics.
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
Place the steps below in the correct order for the construction of a control chart.
Calculate the probability that the median of the sample or average medians is:
Compare these with the percentages specified by Tchebysheff's Theorem.
At the .01 significance level, is there a relationship between job pressure and age?
Let independent variable x represent years since 1950. Determine quadratic regression model for per capita cigarette consumption.
Determine the highest number of miles (to nearest whole number) that motorist could drive in month and still qualify for discount?
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