Mathematics
Mathematics, 15.07.2019 10:30, TheSpeedster

Suppose a sample of 60 business majors revealed that the average time spent studying per week is 22 hours with a standard deviation of 4 hours. for a student reporting that he studies 16 hours per week, what is his corresponding z-score?

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Mathematics, 28.06.2019 18:00, lifewseth
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours. a random sample of 4 students was taken in order to estimate the mean study time for the population of all students a. find the standard error of the mean b. what is the probability that the sample mean exceeds the population mean by more than 2 hours? c. what is the probability that the sample mean is more than 3 hours below the population mean? d. what is the probability that the sample mean differs from the population mean (on either side) by more than 4 hours? e. suppose that a second (independent) random sample of ten students was taken. without doing the calculations, state whether the probabilities in b, c, and d would be higher, lower, or the same for the second sample.
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Mathematics, 28.06.2019 20:30, eylinglez3ovm16v
In order to estimate the average time spent per student on the computer terminals at a local university, data were collected for a sample of 81 business students over a one-week period. assume the population standard deviation is 1.8 hours. a) find standard of error of the mean? b) with a 0.95 probablity, what is the margin of error (approximately)? c) if the sample mean is 9 hours, then the 95% confidence interval is approx?
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Mathematics, 26.07.2019 01:30, adearing2426
According to a 2014 research study of national student engagement in the u.s., the average college student spends 17 hours per week studying. a professor believes that students at her college study less than 17 hours per week. the professor distributes a survey to a random sample of 80 students enrolled at the college. from her survey data the professor calculates that the mean number of hours per week spent studying for her sample is 15.6 hours per week with a standard deviation of 4.5 hours per week. the professor chooses a 5% level of significance. what can she conclude from her data?
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Mathematics, 30.10.2019 05:31, genesist720
According to nielsen media research, the average number of hours of tv viewing by adults (18 and over) per week in the united states is 36.07 hours. suppose the standard deviation is 8.8 hours and a random sample of 41 adults is taken. appendix a statistical tables a. what is the probability that the sample average is more than 35 hours? b. what is the probability that the sample average is less than 38.8 hours? c. what is the probability that the sample average is less than 30 hours? if the sample average actually is less than 40 hours, what would it mean in terms of the nielsen media research figures? d. suppose the population standard deviation is unknown. if 71% of all sample means are greater than 48 hours and the population mean is still 36.07 hours, what is the value of the population standard deviation?
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