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From her firm’s computer telephone log, an executive found that the mean length of 64 telephone calls during July was 4.48 minutes with a standard deviation of 5.87 minutes. She vowed to make an effort to reduce the length of calls. The August phone log showed 48 telephone calls whose mean was 2.396 minutes with a standard deviation of 2.018 minutes. (a) State the hypotheses for a right-tailed test. (b) Obtain a test statistic and p-value assuming unequal variances. Interpret these results using α = .01. (c) Why might the sample data not follow a normal, bell-shaped curve? If not, how might this affect your conclusions?
(a) Write the fitted regression equation, (c) What is your conclusion about the slope.
Cardio-Pulmonary Resuscitation (CPR). In 180 days of school, about how many days can we expect that the teacher on bus duty will likely be certified in CPR?
If you select a random sample of 100 sessions, what is the probability that the sample mean is between 7.8 and 8.2 minutes?
a) Under what circumstances can z be greater than one? b) Under what circumstances can a probability be greater than one?
School seniors in his random sample, 159 believe that "getting rich" is an important goal. Can he conclude, at the 0.05 level of significance, that the proportion has indeed changed?
let X have one of the following distributions: if the prior probabilities are P(H0)= P(HA) which outcomes favor H0? What prior probabilities correspond to the decision rules with a= 0.2 and a =0.5
The length of country and western songs is normally distributed and has a mean of of 170 seconds with a standard deviation of 49 seconds. find the probabality that a random collection of 16 songs will have a mean of 158.30 seconds or less?
Test at 5% significance level null hypothesis that population mean is 40 hours against alternative that it is higher.
The table given below shows numbers of patients classified as underweight, normal weight, overweight and obese according to their diabetes status. Determine the probability that they are overweight?
Determine wheter the given procedures results in a binominal distribution. If it is not binomial, identify the requirements that are not satisfied.
Binomial distribution for large values of the number of trials, n. Suppose that Y has a binomial distribution with n trials and probability of success on any one trial denoted by p. How we can obtain P (Y B)?
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
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