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A researcher has developed a new drug designed to reduce blood pressure. In an experiment, 21 subjects were assigned randomly to the treatment group, and received the new experimental drug. The other 23 subjects were assigned to the control group, and received a standard, well known treatment. After a suitable period of time, the reduction in blood pressure for each subject was recorded. A summary of these data is: Treatment n=21 xbar=23.48 s=8.01 Old Drug n=23 xbar=18.52 s=7.15 The researcher suspects that the new drug results in greater average reduction in blood pressure than the old drug does.
1.) The P-value for the test described in (again, using Option 2 for degrees of freedom) is:
A. larger than 0.05.
B. between 0.025 and 0.05.
C. between 0.04 and 0.05.
D. between 0.02 and 0.025.
a study by hewitt associates showed that 79 of companies offer employees flexible scheduling. suppose a researcher
a simple computer game is designed as follows at the start of the game 5 identical icons are displayed on the screen
Construct a 95% confidence interval to estimate the population mean with a sample mean = 110 and ? = 30 for the following sample sizes:
Briefly describe how the standard deviation influences the outcome of the hypothesis test. How does standard deviation influence measures of effect size?
four mutually exclusive events a b c and d have probabilities of 0.1 0.2 0.3 and 0.4 respectively. what are the
Using the 0.05 significance level what should we conclude about the theory that 24hrs. is a natural cycle? a) use hypothesis steps b) sketch distribution c) explain to someone who never took this course.
An automobile insurance company estimates the following loss probabilities for the next year on a $25,000 sports car:
Standard deviation was $15.50. For 56 Model B ovens, the mean repair cost was $85 and the standard deviation was $30. At alpha=.01, would you buy Model A?
Assume the probability that you will make a sale on any given telephone call is 0.11. Find the probability that you make your first sale on the fifth call, make your sale on the first, second, or third call, and do not make a sale the first three ..
A health researcher is interested in determining whether or not the speed at which people walk is related to their cholesterol levels. He picks 100 adult volunteers at random, checks their cholesterol levels, and then times each one while they wal..
a recent survey asked adults about their beliefs about premarital sex and whether they thought birth control should be
a multiple choice quiz has 5 questions each with 5 answer choices. only one of the choices is correct. you have no idea
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