A basketball fan is interested in estimating the true average number of points scored in men’s...
A basketball fan is interested in estimating the true average number of points scored in men’s NCAA basketball games. She has randomly sampled 150 games and has determined that the sample mean is 118 and the population standard deviation is 29. What interval did she get when calculating the 92% confidence interval for the true mean?
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A basketball fan is interested in estimating the true average
number of points scored in men’s...
The average number of points scored per team in Oregon high school basketball games is μ...
The average number of points scored per team in Oregon high school basketball games is μ = 86 with a standard deviation of σ = 7 points. Coach Tom thinks that Portland teams score more than average. Coach Tom randomly chooses 30 Portland games and finds a sample mean of x = 90 points. Does this provide sufficient evidence to claim that the population mean of points scored by Portland high school basketball teams is higher than the average of...
Suppose that a manager is interested in estimating the average amount of money customers spend in...
Suppose that a manager is interested in estimating the average amount of money customers spend in her store. After sampling 36 transactions at random, she found that the average amount spent was $37.85. She then computed a 99% confidence interval to be between $32.89 and $42.81. Which statement gives a valid interpretation of the interval? O There is a 99% chance that the mean amount spent by all customers is between $32.89 and $42.81. O The store manager is 99%...
THIS Quiz: 16 pts possible A decision maker is interested in estimating the mean of a...
THIS Quiz: 16 pts possible A decision maker is interested in estimating the mean of a population based on a random sample. She wants the confidence level to be 99% and the margin of error to be 0.30. She does not know what the population standard deviation is, so she has selected the pilot sample below. Based on this pilot sample, how many more items must be sampled so that the decision maker can make the desired confidence interval estimate?...
16. A researcher is interested in estimating the mean weight of ten-year old children. Based on...
16. A researcher is interested in estimating the mean weight of ten-year old children. Based on a simple random sample of 92 ten year olds, the 90% confidence interval for the population mean was 94.4 < μ < 99.6 pounds. Which of the statements below is the best interpretation of this confidence interval? a. There is a 90% chance that the true value of μ will fall between 944 and 996. b. If many different samples of size 92 were...
A meteorologist in Jenkins county is interested in estimating the average annual rainfall of the region....
A meteorologist in Jenkins county is interested in estimating the average annual rainfall of the region. The annual rainfall is assumed to follow a normal distribution. She takes a sample of last 10 years and obtains an alterage annual rainfall of 39.5 inches and a standard deviation of 3.8 inches. Estimate a 95% confidence interval for the population mean. 39.5 +/-
19. The owner of a local convenience store is interested in the average amount spent per...
19. The owner of a local convenience store is interested in the average amount spent per shopper at a competing convenience store. To find out, she randomly sampled 49 shoppers and asked how much they spent the last time they went to the competing store. The mean expenditure of the 49 customers was $5.82. Assuming the distribution of spending has a Normal distribution with mean μ and standard deviation σ = $1.11, a 92% confidence interval for μ is: ($5.41,...
7 A car manufacturer is interested in estimating the true mean fuel consumption in real-world city...
7
A car manufacturer is interested in estimating the true mean fuel consumption in real-world city driving for one of its new models. 10 new randomly selected cars are driven for a tank, and it is found that the sample mean fuel consumption is 9.4 l/100k, with a sample standard deviation of s = 0.343. Suppose the manufacturer wishes to construct a confidence interval for mu, the true mean fuel consumption for this model under these conditions. a) What is...
A school principal was interested in whether students in the chess club scored above or below...
A school principal was interested in whether students in the chess club scored above or below the mean grade point average (GPA) at her school. She calculated the average GPA at the school to be 2.55 with σ = .5 and noted that the distribution was approximately normal. She then calculated the average GPA for 15 students in the chess club. Their mean GPA was 2.76. Did this group represent a population different from students in general at this school?...
You are interested in finding a 90% confidence interval for the average number of days of...
You are interested in finding a 90% confidence interval for the average number of days of class that college students miss each year. The data below show the number of missed days for 12 randomly selected college students. Round answers to 3 decimal places where possible. 12 3 5 0 12 5 0 12 10 11 3 4 a. To compute the confidence interval use a ? z t distribution. b. With 90% confidence the population mean number of days of...
Confidence Intervals using the one-sample t-statistic A researcher was interested in estimating the average number hours...
Confidence Intervals using the one-sample t-statistic A researcher was interested in estimating the average number hours of sleep of her graduate statistics students. The researcher obtained a random sample of 6 graduate statistics students and asked them the number of hours of sleep. She then calculated a 95% confidence interval to estimate the population average number of hours of sleep The data appear in the table below. Hours of sleep 19 21 21 30 21 20
Suppose that a manager is interested in estimating the average amount of money customers spend in her store. After sampling 36 transactions at random, she found that the average amount spent was $37.85. She then computed a 99% confidence interval to be between $32.89 and $42.81. Which statement gives a valid interpretation of the interval? O There is a 99% chance that the mean amount spent by all customers is between $32.89 and $42.81. O The store manager is 99%...
THIS Quiz: 16 pts possible A decision maker is interested in estimating the mean of a population based on a random sample. She wants the confidence level to be 99% and the margin of error to be 0.30. She does not know what the population standard deviation is, so she has selected the pilot sample below. Based on this pilot sample, how many more items must be sampled so that the decision maker can make the desired confidence interval estimate?...
16. A researcher is interested in estimating the mean weight of ten-year old children. Based on a simple random sample of 92 ten year olds, the 90% confidence interval for the population mean was 94.4 < μ < 99.6 pounds. Which of the statements below is the best interpretation of this confidence interval? a. There is a 90% chance that the true value of μ will fall between 944 and 996. b. If many different samples of size 92 were...
A meteorologist in Jenkins county is interested in estimating the average annual rainfall of the region. The annual rainfall is assumed to follow a normal distribution. She takes a sample of last 10 years and obtains an alterage annual rainfall of 39.5 inches and a standard deviation of 3.8 inches. Estimate a 95% confidence interval for the population mean. 39.5 +/-
7
A car manufacturer is interested in estimating the true mean fuel consumption in real-world city driving for one of its new models. 10 new randomly selected cars are driven for a tank, and it is found that the sample mean fuel consumption is 9.4 l/100k, with a sample standard deviation of s = 0.343. Suppose the manufacturer wishes to construct a confidence interval for mu, the true mean fuel consumption for this model under these conditions. a) What is...
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