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A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spend studying per week. Based on a simple random sample, they surveyed 140 students. The statistics showed that students studied an average of 19 hours per week with a standard deviation of 14 hours. What is the probability that a sample mean would exceed 19 hours per week?
a chi-square goodness-of-fit test is to be performed. the relative frequencies for the null hyupothesis and the sample
Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study
The following data represents the amount of time ( in minutes ) that a person had to wait for a bus to work on a random sample of 5 working days.
you are mindlessly piloting your f-14 tomcat home from a mission cruising along at subsonic speed along a horizontal
the intelligence quotient iq test scores for adults are normally distributed with a mean of 100 and a standard
Faced with rising Fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below.
Milligrams with standard devation s=1.0 milligram. construct a 95% confidence interval for the difference between the mean nicotine content of two brands of cigarettes.
What percent of batteries have a life span that is more than 2275 hours? Would it be unusual for a battery to have a life span that is more than 2275 hours? Explain your reasoning.
The cholesterol levels of a population have a normal distribution with a mean of 160 and a standard deviation of 30 how you I find the percentage of the population with cholesterol levels above 200.
the miles-per-gallon obtained by the 2010 model q cars is normally distributed with a mean of 22 miles-per-gallon and a
Discuss why the independent t-test is called independent. What does this analysis have to do with variance within and between groups?
find z value describeda find z such that 82 of the standard normal curve lies to the right of z.b find the z value such
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