Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week . A sample 55 weekly reports showed a sample mean of 19.5 customer contacts per week . The sample standard deviation was 5.3 . Provide 90% and 95 % confidence intervals for the population mean number of weekly customer contacts for the sales personnel . 90% Confidence interval , to 2 decimals : 95% Confidence interval , to 2 decimals :

Q: A geologist examine 16 seawater samples for mercury concentration. The main mercury concentration…

A:

Q: Among those taking the Graduate Record Exam, 18 people are randomly selected. This group had a mean…

A: n = 18 s =140 mu = 550

Q: 19. Yellowstone Park Medical Services provides emergency health care for park visitors. An average…

A: Given: μ = 21.7 σ = 4.2 Formula Used: Control limits = μ ± 3σ Upper control limit = μ + 3σ Lower…

Q: if a sample n = 16, mean = 10.3,standard deviation is 2.6. calculate a 95% confidence interval.

A:

Q: A physicist examines 4 seawater samples for iron concentration. The mean iron concentration for the…

A: Given dataSample size(n) = 4Sample mean = 0.185 cc/cubicSample standard deviation =…

Q: A random sample of 25 books is taken from a publisher's stock.  On average, each sampled book has 30…

A:

Q: Hospital Noise Levels For a sample of 26 operating rooms taken in a hospital study, the mean noise…

A:

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: 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 random sample of nine people, the mean driving distance to work was 25 miles the sample…

A:

Q: professor wants to estimate how many hours per week her students study.  A simple random sample of…

A:

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: A study found the temperature of 125 randomly selected healthy adults averaged 98.25 F with a…

A: It is given that sample mean is 98.25 and standard deviation is 0.733.

Q: random sample of eight ​people, the mean driving distance to work was 23.6 miles and the standard…

A: Given, sample mean (x̄) = 23.6 sample standard deviation (s) = 5.1 sample size (n) = 8

Q: A survey was conducted that asked 1019 people how many books they had read in the past year. Results…

A:

Q: Michelle takes a sample of 25 different-gender married couples. In her sample, she found that the…

A:

Q: For an SRS of 66 students, the average exam score was a 73. Assume you know the population standard…

A: Given,Standard deviation(σ)=10margin of error(E)=1.0α=1-0.99=0.01α2=0.005Z0.005=2.58     (from…

Q: A researcher examines 88 sedimentary samples for nitrate concentration. The mean nitrate…

A: Solution:Given thatNumber of samples (n) = 88Sample mean = 0.688Standard deviation = 0.0701

Q: A survey was conducted that asked 1017 people how many books they had read in the past year. Results…

A: The provided information is  x¯=12.2s=16.6n=1017α=0.10The degrees of freedom is…

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: Here are summary statistics for randomly selected weights of newborn girls: n = 250, x= 32.4 hg, s=…

A: The following information has been provided: The sample size is n=20. The sample mean is x¯=32.5.…

Q: A survey was conducted that asked 1016 people how many books they had read in the past year. Results…

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: lculating the confidence interval.

A: x Freq 1 3 2 5 3 19 4 7 5 6 Total 40

Q: Hospital Noise Levels For a sample of 26 operating rooms taken in a hospital study, the mean noise…

A: Given: Sample size (n) = 26 Sample standard deviation (s) = 8.9

Q: A survey was conducted that asked 1019 people how many books they had read in the past year. Results…

A:

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

A:

Q: A survey was conducted that asked 1002 people how many books they had read in the past year. Results…

A: Answer - Given sample size n = 1002                 x  = 12.1,  and   s = 16.6               95%…

Q: A survey was conducted that asked 1018 people how many books they had read in the past year.…

A:

Q: We have a distribution with a mean of ? = 78.0 and ? = 12.5. Find the raw score equivalents for the…

A: We have given that.   X~N( μ , ?^2 )   μ =78 , ? =12.5   Z-score =( x - μ )/?   NOTE:- According to…

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

A: