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Question: A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then recorded. The mean weight was 2.2 pounds with a standard deviation of 0.1 pounds. The population standard deviation is known to be 0.2 pounds.
1. What would happen if 40 heads of lettuce were sampled instead of 20, and the confidence level remained the same?
Perform the appropriate test of hypothesis to determine whether Kim's average time has changed. Use alpha=.01. Compute the power of the test if Kim's actual mean swimming time is 147.3 seconds. Interpret the results.
Using the p-value approach, test to determine whether or not the mean age of all employees is significantly more than 40 years.
An analyst for the firm is interested in assessing the probability that a person who inquires about the firm will eventually purchase stock (event S) or bonds (event B). Define the union and the intersection of these two events.
a bagel shop wants to estimate their daily demand for their popular poppy seed bagel. the shop owner determined that
Scale with a standard deviation of 10. Calculate and interpret the 90 precent confidence interval for the pipulation mean level of satisfaction.
1 a datset is provided on a 2 factor experiment on the amount of crop yield from 3 different farming methods and 4
Anesthesia is used in surgery to induce unconsciousness. One problem with drug-induced unconsciousness is large differences in patient responsiveness. Furthermore, the patient response changes during an operation.
How many heads came up in each set of tosses? How close is the number of heads to half the number of tosses?
Which of the t-test methods are you going to use and why? Formulate the null and alternative hypothesis. Determine the criterion for rejection or nonrejection of the null. What is the t-statistic for this analysis
Plot the control limits for the mean outside diameter and the range.
Find the equation of the regression line to predict course grades from placement test scores.
Do you think a sample of 25 is large enough to give them the margin of error they want? If not, how large a sample do you suggest they take?
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