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Question: Caffeine. A student study of the effects of caffeine asked volunteers to take a memory test 2 hours after drinking soda. Some drank caffeine-free cola, some drank regular cola (with caffeine), and others drank a mixture of the two (getting a half-dose of caffeine). Here are the 5-number summaries for each group's scores (number of items recalled correctly) on the memory test:
a) Describe the W's for these data.
b) Name the variables and classify each as categorical or quantitative.
c) Create parallel boxplots to display these results as best you can with this information.
d) Write a few sentences comparing the performances of the three groups.
You ask your neighbor to water a sickly plant while you are on vacation. Without water it will die with probability .8; with water it will die with probability .15. You are 90 percent certain that your neighbor will remember to water the plant. ..
The students in Ms. Ramirez's math class have birthdays in each of the four seasons. Table shows the four seasons, the number of students who have birthdays.
Your instructor will now provide the data from all teams. Using a graphing calculator or computer, construct dot plots of the sample proportions for each sample size.
Why we seek significance. Asked why statistical significance appears so often in research reports, a student says, "Because saying that results are significant.
What is the name of the test you will run? Run the appropriate SPSS test and include the SPSS output here. What are the results of the test? What is the p-value? Compare the p value to alpha and note the result.
A jar contains 12 marbles, 5 of which are blue and 7 of which are red. If 4 marbles are chosen at random and without replacement, what is the probability of selecting 3 blue ones and 1 red one?
it has been stated that 75 of the population have a smart phone. if you randomly choose 10 people what is the
A bond analyst is analyzing interest rates for corresponding municipal bonds issued by two different states. At α = .05, is there a difference in interest rates paid by two states?
according to u.s. news amp world report data in 1995 tuition costs at indiana university a public university were 2984
1) Suppose that 25 examinees are picked at random. Let X be the mean GMAT score of the 25 examinees selected. Find the mean and standard deviation of the sample mean GMAT score X. 2) Find the probability that the mean GMAT score X of the sample of ..
Refer to given Example and the data for the nitrogen content in a certain fertilizer mix. Ifit is desired that the proportion nonconforming be within 0.5% and the level of type I error be limited to 0.025, find the modified control limits for the ..
Suppose you know that the distribution of sample proportions of nonresidents in samples of 200 students is normal with a mean of 0.04 and a standard deviation of 0.03.
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