An administrator in charge of undergraduate education on a large campus wanted to estimate the average number of books required by instructors. Using bookstore data, she drew a random sample of 15 courses for which she obtained a sample mean of 3.2 books and a sample standard deviation of 0.5. Construct a 99% confidence interval to estimate the mean number of books assigned by instructors on campus. Write a concluding statement.

Q: In a survey, 8 people were asked how much they spent on their child's last birthday gift. The…

A: The sample size, i.e., the sampled number of people, n=8.The sample mean, x¯=$37.The sample standard…

Q: In a survey, 29 people were asked how much they spent on their child's last birthday gift. The…

A: Givensample size(n)=29mean(x¯)=47standard deviation(s)=2α=1-0.95=0.05α2=0.025Degrees of…

Q: Find the margin of error at a 90% confidence level.

A:

Q: A survey was conducted that asked 1011 people how many books they had read in the past year. Results…

A: Givensample size(n)=1011Mean(x)=14.7standard deviation(s)=16.6confidence level=95%

Q: In a survey, 28 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: A Seattle consumer agency believes that plumbers’ rates are too high and wants to estimate the mean…

A: GivenConfidence Interval(c)=95%Margin of Error(E)=3%=0.03Let…

Q: A biologist is interested in studying the effect of vitamin supplements on deer mouse body length.…

A: Note: According to Bartleby, expert solve only one question and rest can be reposted.

Q: In a survey, 25 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: For a sample of 120 businesses, the average profit they generate in a month is $54,000 with a…

A: We have given that,  Average or sample mean (x̄) = 54000, standard deviation (s) = 8800 and sample…

Q: A survey was conducted that asked 1007 people how many books they had read in the past year. Results…

A: Sample mean = x̅ = 14.3 Sample size = n = 1007 Sample S.D = s = 16.6 Standard Error = s/√n  =…

Q: In a survey, 24 people were asked how much they spent on their child's last birthday gift. The…

A: Since population standard deviation is unknown, Use t-distribution to find t-critical value. Find…

Q: A survey was conducted that asked 1006 people how many books they had read in the past year. Results…

A: From the provided information, Sample size (n) = 1006 Sample mean (x̄) = 11.1 Sample standard…

Q: In a survey, 27 people were asked how much they spent on their child's last birthday gift. The…

A: Since the population standard deviation is unknown, t distribution can be used for the computation…

Q: In a survey, 28 people were asked how much they spent on their child's last birthday gift. The…

A: Since population standard deviation is unknown, Use t-distribution to find t-critical value. Find…

Q: A survey was conducted that asked 1007 people how many books they had read in the past year. Results…

A: given data, n=1007df=n-1=1007-1=1006x¯=13.3s=16.6CI=0.99α=1-0.99=0.01we have to find out the…

Q: In a survey, 23 people were asked how much they spent on their child's last birthday gift. The…

A: We have given that  Sample size=n=23 Mean=mu=37 Standard deviation=S=4 90% confidence level

Q: In a survey, 15 people were asked how much they spent on their child's last birthday gift. The…

A: given data  n = 15x¯ = 39s = 980% ci for μ. find ME = ?

Q: In a survey, 22 people were asked how much they spent on their child's last birthday gift. The…

A: Solution: From the given information, confidence level is 0.80, σ=$10 and n=22.

Q: In a survey, 23 people were asked how much they spent on their child's last birthday gift. The…

A: Since population standard deviation is unknown, use t-distribution to find t-critical value. Find…

Q: A survey was conducted that asked 1005 people how many books they had read in the past year. Results…

A: Mean =14.4 standard deviation =16.6 sample size =1005

Q: In a survey, 24 people were asked how much they spent on their child's last birthday gift. The…

A: The sample size is n=24 mean is =39 the standard deviation is =3.The confidence level is 95%, then…

Q: The University of Sydney conducted a survey to find out the average number of hours an academic…

A:

Q: A simple random sample of size n is drawn from a population that is normally distributed. The sample…

A: Note: As per our guidelines we are supposed to answer only one question per post so i am solving…

Q: The mean cost of a meal for two in a mid-range restaurant in Tokyo is $40 (Numbeo.com website,…

A: Given the mean cost of a mean for two in mid- range restaurant in tokyo is $40.The data for cost of…

Q: A survey was conducted that asked (1004 people how many books they had read in the past year.…

A:

Q: The percent fo Coloradans that own a Subaru is 56%. If you were to take a random sample of size 70,…

A: We have given that,  Let X be the random variable from binomial distribution with probability (p) =…

Q: n elephants, the mean weight of a newborn elephant is 244 pounds with a population standard…

A: Here it is given that - Number of samples (n) = 100 Mean (x¯) = 244 Standard deviation (σ) = 11

Q: Assume the managers have requested estimates of the mean attitudes towards each mall with a margin…

A: M.E= 0.05 Springdale Mean -3.81 Springdale STDEV - 1.06 West Mall Mean - 3.41 West Mall STDEV - 1.18…

Q: In a survey, 12 people were asked how much they spent on their child's last birthday gift. The…

A: Since population standard deviation is unknown, Use t-distribution to find t-critical value. Find…

Q: In a survey, 48 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: A survey was conducted that asked 1004 people how many books they had read in the past year. Results…

A:

Q: In a survey, 31 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a survey, 10 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a survey, 35 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a survey, 21 people were asked how much they spent on their child's last birthday gift. The…

A: Givensample size(n)=21Mean(x)=34standard deviation(s)=6confidence level=80%

Q: a. b. Find the best point estimate of the population mean. Construct and interpret the 85%…

A: here given ,  sample size  = n= 20  sample mean = $48.60 sample standard deviation  = $3.53  here…