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A study of 102 patients who had digestive-tract surgery found that those who chewed a stick of gum for 15 minutes at mealtimes ended up being discharged after an average of 4.4 days in the hospital, compared to an average of 5.2 days for their counterparts who were not provided with gum.
Assuming (1) a sample size of 51 for each group and (2) sample standard deviations of 1.3 and 1.9 days, respectively, use a z-test and the 0.01 level of significance in examining whether the mean hospital stay for the gum-chewing patients could have been this much lower simply by chance.
Determine and interpret the p-value for the test.
Perform the test as it should have been done and find if you come to a different conclusion. Explain why the results were different and why your test was a stronger and more reliable test.
Explain briefly why ANOVA was the appropriate analysis for these data and finish the ANOVA table giving the F-statistic, degrees of freedom, and approximating the p-value. Show your work. What is your conclusion about the flavor quality of the differ..
to be able to conduct a t-test it is importantthat the independent- as well as the dependent variable is measured on a
in a survey of 2480 golfers 15 said they were left-handed. the surveys margin of error was 3. construct a confidence
Which of the following descriptions of confidence intervals is correct? (Select all that apply). When conducting a hypothesis test, which one of the following p-values would you feel most confident to reject the null hypothesis
Cheap-As-Dirt Rental Company advertises that the average cost of a rental they find forundergraduate students at the University of Oregon is $540 with a standard deviation of$75 (Let us assume the rents are approximately Normally distributed.) The..
What is the minimum sample size?- If the actual percentage defective may be anywhere between 3% and 6%, tabulate the minimum sample size required for actual percentage defective from 3% to 6%.
the acceptable level for insect filth in a certain food item is 4 insect fragments per 10 grams. a sample random of 50
A marketing company performed a risk analysis for a manufacturer of synthetic fibers and concluded that new competitors present no risk 13% of the time, What is the range of the joint probability distribution of X, Y, and Z
Use Markov's inequality to find an upper bound on the probability of having more than 200 cars arrive in an hour.
What nonparameiric test can be used to distinguish total heart weight of males with left-heart disease with that of normal males? Write and Implement test and report a p-value.
By using the results above & α=0.05, develop a regression model to predict sales from advertisement expenses incurred by performing the following steps.
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