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Occupation and diet, continued. Use of the pooled two-sample t test is justified in part (b) of the previous exercise. Explain why. Find the P-value for the pooled t statistic, and compare it with your result in the previous exercise.
Exercise Occupation and diet. Do the diets of various occupational groups differ? A British study of this question compared 98 drivers and 83 conductors of London double-decker buses.40 The conductors' jobs require more physical activity. The article reporting the study gives the data as "Mean daily consumption (± se)." Some of the study results follow:
(a) What does "se" stand for? Give x‾ and s for each of the four sets of measurements.
(b) Is there significant evidence at the 5% level that conductors consume more calories per day than do drivers? Use the two-sample t method to give a P-value, and then assess significance.
(c) How significant is the observed difference in mean alcohol consumption? Use two-sample t methods to obtain the P-value.
(d) Give a 95% confidence interval for the mean daily alcohol consumption of London double-decker bus conductors.
(e) Give a 99% confidence interval for the difference in mean daily alcohol consumption between drivers and conductors.
in a study by peter d. hart research associates for the nasdaq stock market it was determined that 20 of all stock
if a sample is subdivided into subsamples a minimal sample size of 30 is necessary for every subsample?a. trueb.
What are the assumptions of a correlated-groups t-test? What measure of effect size is used for a correlated groups t-test?
Determine the Midrange. Determine the Standard Variance. Determine the Standard Deviation
Define appropriate vectors and matrices to formulate the LP problem as a set of matrix equations
Valuation of an MNC Birm Co., based in Alabama, is considering several international opportunities in Europe that could affect the value of its firm. The valuation of its firm is dependent on four factors: (1) expected cash flows in dollars,
Use the PivotTable option in the Data tab to produce a frequency table (one- pivot table) and then construct a bar chart of newspaper readership preferences using the Column option in the Insert > Charttab. Interpret the summary statistics. Formula..
a random sample of 42 college graduates who worked during their program revealed that a student spent an average 5.5
A random sample of n = 4 scores is chosen from the population with µ = 80 and σ = 20. On average, how much difference would you expect between sample mean and population mean?
question 1 if 100 random samples of size n were drawn and if for each a 99 confidence interval fornbspmu was computed
The Kirschner Company has a contract to produce garden hoses for a customer. Kirschner has 5 different machines that can produce this kind of hose. Write the constraint that indicates they have to use at least three of the five machines in their p..
suppose that the weights of cinder blocks at a local construction yard follow a normal distribution with mean of 20 kg
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