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A study group of long distance phone calls made from the corporate offices of Pepsi Bottling Group, Inc., in Somers, New York, revealed the length of the calls, in minutes, follows normal probability distribution. The mean length of time per call was 4.2 minutes and the standard deviation was 0.60 minutes.
a. What fraction of the calls last between 4.2 and 5 minutes?
b. What fraction of the calls last more than 5 minutes?
c. What fraction of the calls last between 5 and 6 minutes?
d. What fraction of the calls last between 4 and 6 minutes?
e. As part of her report to the president, the director of communications would like to report the length of the longest (in duration) 4 percent of calls. What is this time?
At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
A professor of math refutes the claim that the average student spends 3 hours studying for the midterm exam. Which hypothesis is used to test the claim?
Data on distribution of cost for building effort, design work and testing effort.
Provide a discussion that supports the assumption that the variance of savings increases with family income.
Twelve doctor's offices were given 3 lab inspections with the following results:
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
MATH1550H: Assignment:Questions: (Genetics) What is the probability that at most two of the offspring are aa?
Determine the dependent variable(s)? Determine the value of the statistic? Write down the name of one variable not mentioned in this study that one might wish to control for.
Test the hypothesis that no difference exists between the groups at α = .05 and perform and report all related tests and statistics.
An educational study utilizes a simple pre post design to assess the efficacy of a computer tutor for solving inequalities.
Suppose that sales of lemonade and sales of brownies are independent, determine standard deviation in his revenue.
Find the mean and standard deviation of X, the number of students in class, who will develop influenza.
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