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A researcher wants to determine if diet has any effect on blood pressure. People were randomly assigned to receive one of the four diets: a low - fat diet, a high - fish diet, a combination of low - fat diet and high - fish diet, and a regular diet. After 6 months, blood pressures of the four diet groups were compared.
a) Name the experimental design applied in this study.
b) Identify the experimental units in this study.
c) What is the explanatory variable in this study? How many treatments does it have?
d) What is the response variable in this study?
When all factors are taken into account, an insurance company estimates that the probability of my father making a claim for damages to his pontoon boat for 5000 is 0.1.
Construct and interpret the 95% confidence interval for the current process mean. Discuss the possibility that the machine may be in need of adjustment to correct the process mean.
But did not study and randomly guesses each answer. Find the probability that the student passes the quiz with a grade of at least 70% of the questions correct.
at a convenience store the amount of money customers spend has a right -skewed distribution with mean 6.42 and standard
If a particular shipment of thousands of components actually has a 6 percent rate of defects, what is the probability that this whole shipment will be accepted?
Samples of size 49 are taken from a population with a σ of 17. If the mean of the sample is 25, what is the confidence interval at the 90% confidence level?
Find the probability that in a given winter month fewer than 35 cars will be rented. (use the normal distribution to approximate the binomal distribution).
State appropriate hypotheses for testing whether there was a significant difference in the length of the picture's run between theaters in the southeastern part of Dallas and all of Cinemark's other theaters.
Use a 0.05 significance level to test the claim that calls are uniformly distributed over the days of the business week. What does the result suggest about staffing requirements at this call center?
Following are some representative scores. (High scores represent more favorable attitudes.) Calculate for both before and after scores, and write a conclusion based on the standard deviations.
Write an expression for the probability that during a given 1-min period, all of the operators receive exactly the same number of requests.
Two cards are drawn from a standard deck of cards. Determine the probability that the first card is a Heart and the second card is an Ace.
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