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In a recent study of 66 six-month-old infants, the average amount of sleep per day was...
A scientific study was conducted to determine the hours of sleep that college students get per...
A scientific study was conducted to determine the hours of sleep that college students get per night. The college students surveyed slept an average of 7.8 hours per night. The margin of error of the survey was 0.5 hours. Construct a confidence interval for the average hours of sleep per night that college students get.
Recent study stated that if a person chewed gum, the average number of sticks of gum...
Recent study stated that if a person chewed gum, the average number of sticks of gum he or she chewed daily was 8. To test the claim, a researcher selected a random sample of 36 gum chewers and found the mean number of sticks of gum chewed per day was 9. The standard deviation of the population is 1. a) Find a 95% confidence interval for the average number of sticks of gum he or she chewed daily b) Explain...
1. In a recent study of 39 ninth-grade students, the mean number of hours per week...
1. In a recent study of 39 ninth-grade students, the mean number of hours per week that they played video games was 86.6. The standard deviation of the sample was 3.8. a. Find the best point estimate of the population mean. b. Find the 90%confidence interval of the mean of the time playing video games. c. Find the 96% confidence interval of the mean of the time playing video games. d. Find the 98% confidence interval of the mean of...
I n general, high school and college students are the most pathologically sleep-deprived segment of the...
I n general, high school and college students are the most pathologically sleep-deprived segment of the population. Their alertness during the day is on par with that of untreated narcoleptics and those with untreated sleep apnea. Not surprisingly, teens are also 71 percent more likely to drive drowsy and/or fall asleep at the wheel compared to other age groups. (Males under the age of twenty-six are particularly at risk.) The accompanying data set represents the number of hours 25 college...
00 Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from...
00 Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from insomnia. A recent study on sleeping patterns of pilots focused on quantifying deviations from regular sleep hours. A random sample of 15 commercial airline pilots was interviewed, and the pilots in the sample reported the time at which they went to sleep on their most recent working day. The study gave the sample mean and standard deviation of the times reported by pilots, with...
A study of peach trees found that the average number of peaches per tree was 625....
A study of peach trees found that the average number of peaches per tree was 625. The standard deviation of the population is 35 peaches per tree. A scientist wishes to find the 99% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to obtain an average accurate to within 18 peaches per tree? 4 21 23 26
66. Employees earn vacation pay at the rate of one day per month. During July, 25...
66. Employees earn vacation pay at the rate of one day per month. During July, 25 employees qualify for one vacation day each. Their average daily wage is $100 per day. What is the amount of vacation benefit expense for the month of july?
Six-week-old babies in the US consume a mean µ of 15.6 ounces of milk per day,...
Six-week-old babies in the US consume a mean µ of 15.6 ounces of milk per day, with a standard deviation ? of 2 ounces Complete the following. a) Describe the shape and horizontal scaling on the graph of the distribution for amount of milk consumed by the population of all US six-week-old babies. b) Find the probability that the amount of milk consumed by of a randomly selected baby from this group will be less than 14 ounces---that is, find...
all answers please 3. The teachers union is concerned about the amount of time teachers spend...
all answers please
3. The teachers union is concerned about the amount of time teachers spend each week doing schoolwork at home. A simple random sample of 56 teachers had a mean of 8.0 hours per week working at home after school. Assume that the population standard deviation is 1.5 hours per week. a) Construct a 95% confidence interval estimate for the mean number of hours per week a teacher spends working at home. b) Does the confidence interval support...
5. A bank manager wants to know the mean amount of mortgage paid per month by...
5. A bank manager wants to know the mean amount of mortgage paid per month by homeowners in an area. A random sample of 120 homeowners selected from this area showed that they pay an average of $1875 per month for their mortgages. The population standard deviation of such mortgages is $245. Find a 97% confidence interval for the mean amount of mortgage paid per month by all homeowners in this area.
1. In a recent study of 39 ninth-grade students, the mean number of hours per week that they played video games was 86.6. The standard deviation of the sample was 3.8. a. Find the best point estimate of the population mean. b. Find the 90%confidence interval of the mean of the time playing video games. c. Find the 96% confidence interval of the mean of the time playing video games. d. Find the 98% confidence interval of the mean of...
00 Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from insomnia. A recent study on sleeping patterns of pilots focused on quantifying deviations from regular sleep hours. A random sample of 15 commercial airline pilots was interviewed, and the pilots in the sample reported the time at which they went to sleep on their most recent working day. The study gave the sample mean and standard deviation of the times reported by pilots, with...
all answers please
3. The teachers union is concerned about the amount of time teachers spend each week doing schoolwork at home. A simple random sample of 56 teachers had a mean of 8.0 hours per week working at home after school. Assume that the population standard deviation is 1.5 hours per week. a) Construct a 95% confidence interval estimate for the mean number of hours per week a teacher spends working at home. b) Does the confidence interval support...
5. A bank manager wants to know the mean amount of mortgage paid per month by homeowners in an area. A random sample of 120 homeowners selected from this area showed that they pay an average of $1875 per month for their mortgages. The population standard deviation of such mortgages is $245. Find a 97% confidence interval for the mean amount of mortgage paid per month by all homeowners in this area.
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