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Finding the value of test statistic for the given data and also interpret the result.
The Ratter Nursery Company packages their pine bark mulch in 50-pound bags. From a long history, the production department reports that the distribution of the bag weights follows the normal distribution and the standard deviation of this process is 3 pounds per bag. At the end of each day, Jeff Ratter, the production manager, weighs 10 bags and computes the mean weight of the sample. Below are the weights of 10 bags from today's production.
45.6
47.7
47.6
46.2
49.2
55.8
47.5
48.5
a. Can Mr. Ratter conclude that the mean weight of the bags is less than 50 pounds? Use the .01 significance level.
b. In a brief report, tell why Mr. Ratter can use the z distribution as the test statistic.
Evaluate the difference in the mean ratings and find the standard deviation of the difference in the ratings, what is the chance both children are boys?
If the computed value for this problem is +2.33, and the level of significance is 0.05, can we conclude that the recall proportions for the two commercials are same?
Which combination of factors has greatest likelihood of rejecting null hypothesis?
Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.
If a card is drawn at random from a standard 52-card deck, what is the probability that the card drawn is one of the following?
Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?
What is the expected shape of the distribution of the sample mean?
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
Using quadratic regression model find the estimated number of planes.
Such things as historical documents, newspaper reports, TV and radio broadcasts, when used in research, represents
Calculate and interpret standard error of estimate se and coefficient of determination R2 for these data.
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
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