According to Harper’s magazine, the time spend by kids in front of the television set per...

According to Harper’s magazine, the time spend by kids in front of the television set per year can be modeled by a normal distribution with a mean equal to 1500 hours and a standard deviation equal to 250 hours. If 25 kids are randomly selected from this population, what is the probability that the average of their times spent watching television is at least 1650 hours per year?

Expert Solution

milcah answered 1 year ago

b) According to a certain survey, adults spend 2.35hours per day watching television on a weekday....

b) According to a certain survey, adults spend 2.35hours per day watching television on a weekday. Assume that the standard deviation for "time spent watching television on a weekday" is 1.93 hours. If a random sample of 50 adults is obtained, describe the sampling distribution of x overbar, the mean amount of time spent watching television on a weekday. d) One consequence of the popularity of the Internet is that it is thought to reduce television watching. Suppose that a...

According to Harper’s index 55% of all federal inmates are serving time for drug dealing. A...

According to Harper’s index 55% of all federal inmates are serving time for drug dealing. A random sample of 20 federal inmates is selected. What is the probability that 8 or more are serving time for drug dealing? What is the probability that 2 or fewer are serving time for drug dealing? What is the expected number of inmates serving time for drug dealing?

1. Inmates According to Harper’s Index, 53% of all federal inmates are serving time for drug...

1. Inmates According to Harper’s Index, 53% of all federal inmates are serving time for drug dealing. A random sample of 6 federal inmates is selected. (a) What is the probability that 4 or more are serving time for drug dealing? (b) What is the probability that 5 or fewer are serving time for drug dealing? (c) What is the expected number of inmates serving time for drug dealing?

13. According to Harper’s Index, 50% of all federal inmates are serving time for drug dealing....

13. According to Harper’s Index, 50% of all federal inmates are serving time for drug dealing. A random sample of 16 federal inmates is selected. (a) What is the probability that 12 or more are serving time for drug dealing? (b) What is the probability that 7 or fewer are serving time for drug dealing? (c) What is the expected number of inmates serving time for drug dealing?

The amount of time Americans spend in front of a screen has a mean of 11...

The amount of time Americans spend in front of a screen has a mean of 11 hours with a standard deviation of 2.7 hours. What is the probability that a random chosen American spends more than 12 hours in front of a screen? Represent the probability with a graph.

The amount of time Americans spend watching television is closely monitored by firms such as A.C....

The amount of time Americans spend watching television is closely monitored by firms such as A.C. Nielsen because this helps to determine the advertising pricing for commercials. According to a recent survey, adult Americans spend an average of 2.34 hours per day watching television on a weekday. Assume the standard deviation for "time spent watching television on a weekday" is 1.91 hours. A) If a random sample of 60 adult Americans is obtained, what is the probability that the sample...

sorry for spamming multiples The amount of time adults spend watching television is closely monitored by...

sorry for spamming multiples The amount of time adults spend watching television is closely monitored by firms because this helps to determine advertising pricing for commercials. Complete parts (a) through (b). (a) According to a certain survey, adults spend 2.25 hours per day watching television on a weekday. Assume that the standard deviation for "time spent watching television on a weekday" is 1.93 hours. If a random sample of 60 adults is obtained, describe the sampling distribution of x overbar,...

The chassis assembly time for a television set is observed for two operators. A random sample...

The chassis assembly time for a television set is observed for two operators. A random sample of 12 assemblies from the first operator gives an average assembly time of 22 minutes with a standard deviation of 3.5 minutes. A random sample of 10 assemblies from the second operator gives an average assembly time of 20.3 minutes with a standard deviation of 2.2 minutes. a. Find a 90% confidence interval for the ratio of the variances of the operators' assembly times....

1. A sociologist claims that children ages 6-17 spend less time watching television today than children...

1. A sociologist claims that children ages 6-17 spend less time watching television today than children ages 6-17 in 200 1 did. A study was conducted recently and a similar study was conducted in 2001. The results are given below: Recently 2001 Mean amount of time ( hours per weekday) 1.76 2.13 Sample standard deviation 0.47 0.49 Sample Size 40 35 a. Test the claim of the sociologist at 10% level of significance. Use classical approach and label all steps...

A recent article in Healthy Life magazine claimed that the mean amount of leisure time per...

A recent article in Healthy Life magazine claimed that the mean amount of leisure time per week for European men is 48.2 hours. The distribution of leisure time amounts is reported to be approximately Normal. You believe the figure of 48.2 is too large and decide to conduct your own test. In a random sample of 25 European men, you find that the mean is 44.6 hours of leisure per week and that the standard deviation of the sample is...

Question