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A bank is comparing the quality of service given by its two most important branches. In branch A, 192 out of a random selection of 300 of its customers said that they were satisfied with the service. In branch B, 138 out of 250 randomly selected customers said that they were satisfied with the service.
a. At the 5% level of significance, can we infer that branch A has a significantly higher proportion of satisfied customers than branch B?
b. At the 5% level of significance, can we infer that the difference in the level of satisfaction with service between the two branches is wider than 5 p.c. points?
c. Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
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The Type 1 error states the probability of being wrong whenever:
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Using a 1% level of significance, can the hypothesis that the distributions for the student's scores are identical be accepted?
Compute the sample variance and the sample standard deviation for these data (to 2 decimals).
Construct a 99% confidence interval for the population mean tread wear for this type of tire.
A pediatrician is interested in studying the effect of Motrin on reducing temperature in young children. Four children with influenza have their temperatures taken immediately before and then 20 minutes after taking a standard dose
Carry out the suitable calculations to test for effect modification. Interpret your results.
Mean and standard deviation are 584.6 and 34.28
Scores on certain nationwide college entrance examination follow normal distribution with mean of 500 and a standard deviation of 100. Determine the probability that student will score?
The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
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