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The average batter life of the iPhone 4S is reported to be 6.0 hours by Apple. Assume that the population standard deviation for the better life for this cell phone is 30 minutes. A random sample of 50 iPhones had an average better life of 5.7 hours. Determine the margin of error (in hours) for the 90% confidence interval for this sample.
If the student IQ score is 90, what is the probability that another student randomly selected has an IQ score of below 90?
High-pressure sales tactics or door-to-door salespeople can be quite offensive. Many people succumb to such tactics, sign a purchase agreement, and later regret their actions. In the mid-1970s, the Federal Trade Commission implemented regulations ..
thin rubber strips are used to provide increasing resistance to orthopedic patients during large motion exercises. the
Given the consumer is 18 to 24 years old, what is the probability that the consumer uses a plastic card? Given the consumer is over 24 years old, what is the probability that the consumer uses a plastic card?
Compare wet and dry etching in terms of its directionality, selectivity, cleanliness, feature size, and controllability.
Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute distance.
The standard deviation of the expenditure is $3. A simple random sample of 64 students is taken. What are the expected value, standard deviation, and shape of the sampling distribution of the sample mean?
the tread lives of the super titan radial tires under normal driving conditions are normally distributed with a mean of
Use the .02 significance level. 2. The decision rule is to reject H0 if Z greater than ___? 3. Compute the value of the test statistic. The test statistic is Z=___. 4. What is the p value?
q1. according to the statistical abstract of the united states there are 31.1 milshylions one-person households 38.6
Scores on a test have a mean of 73 and Q3 is 81. The scores have a distribution that is approximately normal. Find P90.
according to the center on budget and policy priorities article curbing flexible spending accounts could help pay for
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