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Suppose the results of the analyses in Problem 15-17 are reported and criticized because the participants were not randomized to different diets, and that there may be other factors associated with changes in cholesterol. A third study is run to estimate the effect of the low-carbohydrate diet on cholesterol levels. In the third study, participants' cholesterol levels are measured before starting the program and then again after 6 months on the program. The data are shown below:
Before Program: 210 230 190 215 260 200
After 6 Months : 215 240 190 200 280 210
Is there a significant increase in cholesterol after 6 months on the low-carbohydrate diet? Run the appropriate test at a 5% level of significance.
Their monitoring plan will take a random sample of 5 days sales per month and use the sample mean sales to identify shops that are under-performing. Establish the lower limit sales such that only 5% of the shops would have a sample sales mean belo..
If possible. Find P( )
What is a p-value in testing hypothesis? How does this p-value help us to decide to/not to reject a Null hypothesis?
You are asked to test his claim. How would you write the null hypothesis if: a) you represent the internet provider and want to support the claim?
A research team conducted a study of soft- drink preferences among residents in a test market prior to an advertising campaign for a new cola product. Of the participants, 130 are teenagers and 130 are adults. The researchers secured the following re..
Give a mathematical expression for the probability density function of driving distance.
If the coefficient of correlation is 0.4, the percentage of variation in the dependent variable explained by the variation in the independent variable
the weights of cans of soup produced by a company are normally distributed with a mean of 15g and a standard deviation
What is approximately the largest sample mean of another sample of n= 16 participants you would expect to obtain from this finite population?
We want to determine if the proportion of people in the population who believes this is less than 0.75. What is the p-value?
The lead time is 2 weeks.If you were asked to create an (R,s,S) policy for this, what parameters would you pick? Give your reasons.
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
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