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Question: A large department store wants to test whether the variance of waiting time in two checkout counters is approximately equal. Two independent random samples of 25 waiting times in each of the counters gives s1 = 2.5 minutes and s2 = 3.1 minutes. Carry out the test of equality of variances, using α = 0.02.
one out of 5000 individuals in a population carried a defective gene. a random sample of 1000 individuals is studied.
The sample mean life is 805 hours with 64 hours of the sample standard deviation. Is there enough evidence to conclude that the manufacturer's claim is true at the 5% significance level?
an investigator wants to test if there is a difference in endotoxin levels in children who are exposed to endotoxin as
a card is drawn from a standard deck of 52 playing cards. find the probability that the card is an ace or a heartplease
A manufacturer of a chemical used in glue, attempting to control the amount of a hazardous chemical its workers are exposed to, has given instructions to halt production if the mean amount in the air exceeds 3.0 ppm.
The Penguin Company employs 200 men and 50 women. Of the male employees, 140 work in the plant, 20 are in the office, and 40 are field salesmen.
1. a study sponsored by american express co. and the french government tourist office found that old american
Suppose you always reject the null hypothesis, regardless of any sample evidence.
the scores on a standardized test had mean of 2.711 and a standard deviation of 1.335. a teacher had 61 students take
Using the paired t test because the samples are correlated with each other could be another avenue. This would help us find the p-value and look at the statistical significance in evaluating the quality of care or outcomes in a medical home.
Plant C supplies 20%, with paint mixed incorrectly 20% of the time. If Ponderosa guarantees its product and spent $10,000 replacing improperly mixed paint.
one environmental group did a study of recycling habits in a california community. it found that 74 of the aluminum
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