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Make a scatter plot of the data. What does it suggest about the correlation between X and Y? (b) Use Excel, MegaStat, or MINITAB to calculate the correlation coefficient. (c) Use Excel or Appendix D to find t.05 for a two-tailed test. (d) Calculate the t test statistic. (e) Calulate the critical value of ra. (f) Can you reject p = 0? 12.4 Moviegoer Spending ($) on Snacks Age (X) 30,50,34,12,37,33,36,26,18,46. Spent (Y) 2.85,6.50,1.50,6.35,6.20,6.75,3.60,6.10,8.35,4.35.'
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
Two airlines fly to Memphis. according to airport data for the past year, wings airlines planes arrived on time 330 times and were late 60 times. Global airlines planes arrived on time 430 times and were late 50 times.
Judy's measured potassium level varies according to the Normal distribution with mean = 3.8. If a single potassium measurement is made, what is the probability that Judy is diagnosed as hypokalemic?
A medical supplies company buys its supplies in bulk and redistributes them to doctor's offices and clinics. The receive thermometers in lots of 500 from the vendor. They are considering a sampling plan of n=50 and c=1.
A large population of overdue bills has balances that fallow a normal curve. When we take a sample of 100 of these the average is $500 and the standard deviation is $100.
Is it possible to normalize the data when the population shape has a known skew? How would you demonstrate the central limit theorem to your classmates?
FT% is normally distributed with a mean of 0.721 and a standard deviation of 0.082. Which percentage of NBA players have a FT% lower than 0.784? (Round off to the nearest percent.)
Develop a stem-and-leaf chart. Summarize the number of times each ATM was used. What was the typical, minimum, and maximum number of times each ATM was used?
An automobile manufacturer has a new model that they claim gets 27 miles per gallon. A consumer testing agency chooses 50 of these cars and finds that the sample mean is 25 miles per gallon and the sample standard deviation (s) is 3 miles per gall..
Which of the t-test methods are you going to use and why? Formulate the null and alternative hypothesis. Determine the criterion for rejection or nonrejection of the null. What is the t-statistic for this analysis
Find a 95% confidence interval for the true proportion of patients who experienced cotton mouth. Show your calculations and/or explain the process used to obtain the interval.
What is the expected total weight of 100 randomly chosen babies? What is the standard deviation of the total weight of 100 randomly chosen babies?
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