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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?
What is your null hypothesis? What is your alternative hypothesis? What your decision about the null hypothesis?
The 95% confidence interval for the mean of the sampling distribution of the mean is about:
A biologist has found the average weight of 12 randomly selected mud turtles to be 8.7 lb with standard deviation 3.6 lb. find a 90% confidence interval for the population mean weight of all such turtles.
Any analysis required to check the required conditions (note that if you find that you cannot meet the required conditions for the test you expected to do, you must use the appropriate non-parametric test)
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
At significance levels of .05 and .01 test H 0 : the factors A and B are independent.
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Given that the student you choose is a senior, find out the probability of selecting a non-senior?
Make a scatter plot, illustrate the regression lines. Determine the correlation coefficient between husband’s and wife’s education for couples in which wife is employed full time?
If all samples of size 64 are drawn, mean of sample according to Central Limit Theorem is 100.
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