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Question: A variety of packaging solution sexist for products that must be kept within a specific temperature range. Cold chain distribution is particularly useful in the food and pharmaceutical industries. A packaging company is trying out a new pack aging material that might reduce the variation of temperatures in the box. It is believed that the temperature in the box follows a normal distribution with both packaging materials. Inspectors randomly select 16 boxes of new and old packages, 24 hours after they are sealed for shipment, and report the temperatures in degrees Celsius. We assume that the two samples are drawn in dependently from norm ally distributed populations. A portion of the data is shown below; the complete data, labeled Packaging, are available on the text website.
a. State the appropriate hypotheses to test whether or not the new packaging material reduces the variation of temperatures in the box.
b. U se Excel's F.TEST function to calculate the p -value.
c. Make a conclusion at the 5% significance level.
Draw a bar graph for the endowments (stated in billions of dollars) of each of the universities specified in the following list.
Explain briefly what important fact about confidence intervals is illustrated by comparing these two intervals and the 95% confidence interval from Exercise.
Suppose the rate of return for a particular stock during the past two years was 10% and 30%. Compute the geometric mean rate of return.
Correct answerThe "average" amount of error expected in predictions The number of cases that have a non-zero residual The strength of the correlation between X and Y
For this plot, the sample variance is s2= 0.081 . Test the claim using a = 0.1 that the population variance of annual wheat production for the first plot.
Tony, a single parent, spent $3,600 on after-school care for his six-year-old son. Tony received $1,200 as aid to families with dependent children from the State Department of Social Services (DSS) for child care as part of the welfare assistance ..
Assume that customers enter a store at the rate of 60 persons per hour. a) what is the probability that during 5 minutes interval no one will enter the store?
For a certain coin, Q, is a uniform (0, 1) random variable. Given Q = q, each flip is heads with probability q, independent of any other flip. Suppose this coin is flipped n times. Let K denote the number of heads in n flips.
Gallup Polls When Gallup and other polling organizations conduct polls, they typically contact subjects by telephone. In recent years, many subjects refuse to cooperate with the poll.
For each of the following studies, say whether you would use a t test for dependent means or a t test for independent means.
A machine produces parts with lengths that are normally distributed with ? = 0.59. A sample of 19 parts has a mean length of 76.26.
What percent of the junior Biology majors are ineligible for BioResearch?
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