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To investigate the efficiency of a diet, a random sample of 16 male patients is drawn from a population of adult males using the diet. The weight of each individual in the sample is taken at the start of the diet, and at a follow-up 4 weeks later. Assuming that the population of differences in weight, before versus after the diet, follow a normal distribution, the t test for related samples can be used to determine if there was a significant decrease in the mean weight during this period. Suppose the mean decrease in weights over all 16 subjects in the study is 3.0 pounds with the standard deviation of differences computed as 6.0 pounds.
Referring to the information above, the computed t statistic is:
Test whether the average cycle of sleeping and waking differs significantly from 24 hours.
Two teams of workers assemble automobile engines at a manufacturing plant. Quality control personnel inspect a random sample of the teams assemblies and judge each assembly to be acceptable or unacceptable.
For a dealership group consisting of 100 dealers, determine and interpret the 95% confidence and prediction intervals associated with total revenue.
Then comment on the effectiveness of the presentation: Were the frequency distributions used effectively to report the results? Why or why not?
A standard deck of cards is being used to play a game. There are four suits(hearts, diamonds,clubs, andspades), each having 13 faces(ace, 2,3, 4,5, 6,7, 8,9, 10,jack, queen, and king), making a total of 52 cards. This complete deck is thoroughly m..
scores on the sat mathematics test are believed to be normally distributed with mean micro. the scores of a random
the air temperature was 33of in the night and 66of in the day. so in the day it was twice as warm as in the night.
Suppose that 20% of all homeowners in an earthquake-prone area of California are insured against earthquake damage. Four homeowners are selected at random; let x denote the number among the four who have earthquake insurance.
Suppose the weights of pucks produced at a factory are normally distributed with a mean of 5.75 ounces and a standard deviation of .11 ounce. What percentage of the pucks produced at this factory cannot be used by the National Hockey League?
Two different machine control-button configurations are being tested.- At the 0.05 level, determine whether the treatment effects of the two layouts could be zero.
Formulate the null and alternative hypotheses. State the level of significance. Find the critical value (or values), and clearly show the rejection and nonrejection regions. Compute the test statistic
Using a sample of size n=120, what is the standad deviation of our estimator P? What is the probability that the sample proportion will be at least 0.45?"
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