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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.
Create probability tree showing all marginal, conditional, and joint probabilities. Create a joint probability table.
Compute test statistic and p -value for each sample. (Negative amount must be pointed out by minus sign.)
What proportion of healthy adults have pulse rates that are at most beats/sec? Round your answer to at least four decimal places.
hypothesis test for the difference between two means.the president of the american insurance institute wants to compare
When using the F-statistic for hypothesis testing of the variance, which sample variance is the numerator and which sample variance is the denominator?
a new car that is a gas- and electric-powered hybrid has recently hit the market. the distance travelled on 1 gallon of
The 97.5% CI for mean changes in Group B minus mean change in Group A is (-4.7 to -0.9). Suppose we want to compute a two-sided p-value to compare the two groups.
1. you will throw a fair coin 6 times and will win on heads and lose on tails. denoting a win as a 1 and a loss as a 0
Suppose you toss a die 100 times in a row. What is the probability that you see 4 spots between 10 and 20 times?
A simple random sample of 50 speeds (in mph) is obtained from cars traveling on a section of I-10 through Tallahassee. The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the ..
Company are interested in how a new spaghetti sauce made from green tomatoes (and green in color) will compare to their traditional red spaghetti sauce. They are worried that the green color will adversely affect the tastiness scores.
A large discount chain compares the performance of its credit managers in Ohio and Illinois by comparing the mean dollar amounts owed by customers with delinquent charge accounts in these two states.
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