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A series of 25 wet/new concrete samples were mixed in the lab and then each split in half (like twins!), with the first set of "twins" receiving admixture A and the second set of 25 sub-samples receiving admixture B. Once hardened and strength tested, compressive strength at failure of the first set averaged 50.2 ksi, and the second set averaged 53.4 ksi. The sample standard deviation of the first set of strengths was 8.2 ksi, the second set's S value was 9.8 ksi, and the S value for the 25 differences in strengths was 3.3 ksi. What test statistic will you use to determine whether you can accept a hypothesis that Admixture B creates a stronger concrete than Admixture A?
A jeweler at Tiffany & Company computes the value of the linear correlation coefficient for pairs of sample data consisting of Tiffany prices for gold wedding rings and the corresponding prices at a discount store.
What is the probability that a visually impaired student gets less than 6.9 hours of sleep?
If a time series is stationary without a linear trend or the seasonal component, which of the following forecasting methods may be suitable.
What is the probability that a subscriber rented a car during the past 12 month for business or personal reasons?
The average age of the women was 45.582 with a standard deviation of 5.143. He uses this information to calculate a 95% confidence interval for the differnce in means, (-11.41, -5.422). The best interpretation of this interval is which of the foll..
The possible responses to the question "How would you rate our quality of service?" with 1=excellent, 2=good, 3=fair, 4=poor, describes what type of variable?
If the city manager knows the average salary nationally is $38,300, which test of significance should be used? Why?
Which is the probability that the median of the sample is between $17 and $20?
Do the data indicate a significant difference between the frequency distributions for male and females? Test at the .05 level of significance and describe the difference.
We want to know if his support has decreased. In computing a test of hypothesis with , what is the estimate of the overall proportion?
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
Develop the estimated regression line. Jensen expects to use the machine 30 hours per week, develop a 95% prediction interval for the company's annual maintenance expense.
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