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A chain store decides to test the effectiveness of a new form of packaging for one of its products. In two of its stores, in similar environments and with similar sales profiles, it arranges similar displays of the product. Of the first 100 customers that enter store A, 8 buy the product with the old packaging. Of the first 100 customers that enter store B, 20 buy the product with the new packaging. Calculate the value of χ2. The null hypothesis is that the new packaging is ineffective. If the probability that the value ofχ2, or some larger value, could be obtained with the null hypothesis just by chance is greater than 0.05, then the store will not bother to change the packaging. Do they change it or not?
Compute the sample mean, the sample standard deviation, and the value of the test statistic. Draw a conclusion about the population mean.
Eighty percent of the time, it takes more than how many minutes to find a parking space? (Round your answer to two decimal places.)
The following data are the percentages of employees involved in worker participation programs in a sample of firms. Draw a stem-and-leaf display of the data
1) What is the speed of the wave pulse? 2) What is the tension in the slinky? 3) What is the average speed of a piece of the slinky as a complete wave pulse passes?
Batteries. In a group of 10 batteries, 3 are dead. You choose 2 batteries at random.
The mean construction time for a standard two-car garage by Arrowhead Construction Company is 3.5 days. The time for the construction process follows the normal distribution.
1. a bus starts with eight people 2 of which are jack and diana and stops at 12 locations. assuming nobody else gets on
A total of 183 residents show up for a public hearing on the proposal, and a show of hands finds only 31 in favor of the prison project.
a multiple regression line was calculated in which x1 was a students grade point average and x2 was a students age. the
1. for a two-factor study with 2 levels of factor a 2 levels of factor b and a separate sample of n 10 participants in
What is the decision regarding the null hypothesis (is there a difference in the mean numbers of cameras sold at the three department store chains)?
The population are shorter than 66 inches, what is the probability a randomly selected member of this population is between 66 and 76 inches tall?
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