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1) You did a two-tailed t test for means equality and in step #2 you got a t value of 2.333. Assuming 22 degrees of freedom, calculate the exact step #5 p-value.
2) A new vaccine for Ebola has entered clinical trials. Preliminary results are good but it seems that 5% of treated patients develop the side effect of rashes on their bodies.
a) If 112 people received this vaccine, what is the probability that 5 or more of these people develop the side effects of rashes? Use the normal approximation to a binomial without the continuity correction.
b) If 112 people received this vaccine, what is the probability that two or less people develop the side effects of rashes? Use the normal approximation to a binomial without the continuity correction.
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
(a) a white chip on the first draw?
for each of the following statements about the chi-square x2 distribution state whether it is true or false and
1 what was the mean quantity ordered?a. 48.0 b. 52.7 c. 10 d. 74.52 what percentage of orders is for quantity
The expecyed monetary value with no survey is $62,000. If the expected value of sample information is -$7,000, what is the expected monetary value with the survey?
Is this statistically significant evidence that the candidate has enough valid signatures overall? Explain.
assume that a procedure yields a binomial distribution with a trial repeated n times. use the binomial probabilities
If on the other hand, he believes that the probability that he will get offers from both companies is 0.5, what is the probability that he will get at least one offer from these two companies?
The amount of money spent on lunches. The variance of nine business dinners was $6.12 and the variance of 12 business lunches was $0.87. What is the test value?
a medical test for malaria is subject to some error. given a person who has malaria the probability that the test will
two random samples are taken one from among first-year uva students and the other from among fourth-year uva students.
Two percent of the parts from a production process are defective. A sample of five parts from the production process is selected. What is the probability that the sample contains exactly two defective parts?
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