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1. Test the claim that the mean lifetime of car engines of a particular type is greater than 220,000 miles. Sample data are summarized as n = 23, x = 226,450 miles, and s = 11,500 miles. Use a significance level of α = 0.01. What is the null and alternative hypothesis? What is your final conclusion?
2. The number of standard errors that the sample estimate (p1 - p2) of (p1 - p2) falls from its null hypothesis value of zero is called
A) the test statistic.
B) the margin of error.
C) the P-value.
D) the level of significance.
E) none of the above.
Determine the mean number of times the machine was used per day.
Would you expect the mean absolute percentage error to be more than or less than 0.25? Describe.
A study sponsored by American Express Co. and the French government tourist office found that old American stereotypes about French unfriendliness weren't true.
how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%, I want to know if the results are significant at = 10%. With the information given.
Support colour-coding on packaged food to indicate healthier options
For following scores determine values of each expression: X: 4, 2, 1, & 5. åX, åX 2 , (åX) 2 , å(X-1).
Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention.
In a distribution of scores, the arithmetic mean is 51, the median is 55, and the mode is 62. What is the score, in percentile form, of a subject who does less well than two-thirds of the sample?
Find the area under the normal distribution curve to the right of z = -1.03.
Calculate the suitable mean response time from both proposed locations and find out which proposed site must be selected for the new emergency facility.
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
The Kruskal-Wallis rank test is a nonparametric replacement - The Wilcoxon rank sum test tests a null hypothesis
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