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The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of the sample was 2.7 minutes. Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group Perform the chi-square test for a uniform distribution at α = .01
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
Now compute the standard deviation for this distribution.
In a regression analysis involving 30 observations, the following estimated regression equation was obtained.
What is the appropriate conclusion based on the outcome of the hypothesis test?
The mean amount of time a (unnamed) computer server is down is 18.3 minutes with a standard deviation of 5.7 minutes.
What percent of trucks logged more than 57,060 but less than 58,280 miles? What percent of Fords travelled 62,000 miles or less in the year?
What is Excel formula in B9 giving first value of coefficient in the objective function?
How strong is the evidence against the company's claim? Based on these data, the P -value of the appropriate test
To test the given claim using Single Proportion Z test.
Determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.
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