From a sample of 34 graduate students, the mean number of months of work experience prior to entering an MBA program was 33.42. The national standard deviation is known to be 20 months. What is a 95% confidence interval for the population mean? A 95% confidence interval for the population mean is (Use ascending order. Round to two decimal places as needed)

Q: In a sample of 55 electric motors, the average efficiency (in percent) was 85 and the standard…

A: From the provided information, Sample size (n) = 55 Sample mean (x̅) = 85 Standard deviation (s) = 2…

Q: Nine hundred (900) high school freshmen were randomly selected for a national survey. Among survey…

A: Given,   Sample size = 900 Sample mean = 2.7 Sample standard deviation = 0.4   Calculation:…

Q: On the Standford-Binet test, the mean IQ is 100. A class of 21 kindergarten pupils were tested with…

A: Given Mean(x)=94standard deviation(s)=9.12sample size(n)=21confidence interval = 90%

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Population standard deviation, sigma is 60.The z-critical value for 95% confidence interval is…

Q: A random sample of 54 four-year-olds attending day care centers provided a yearly tuition average of…

A:

Q: In the 2018 General Social Survey, a random sample of 1666 adults in the U.S. was asked how old they…

A:

Q: The average daily volume of a computer stock in 2011 was μ=35.1million​ shares, according to a…

A:

Q: According to a recent poll of eight social networking sites, the average monthly visitor count was…

A: In question, Given that a recent poll of eight social networking sites, the average monthly visitor…

Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

A: Using Excel formula “=NORM.S.INV(1-(0.04/2))”, the critical value for 96% confidence level is…

Q: In a survey, 26 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: How large a sample should be selected to provide a 95%  confidence interval with a margin of error…

A:

Q: he General Social Survey asked: “How many e-mails do you send in a day?” The results of 928…

A:

Q: Determine the sample size needed to construct a 95% confidence interval for the population mean, μ,…

A:

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

A:

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A:

Q: In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta…

A: From the provided information, Sample size (n) = 49 Sample mean (x̅) = $24.80 Population standard…

Q: Find the Confidence interval for the true Population Mean if a sample of 50 has a mean of 26.8 and a…

A:

Q: The 92 million Americans of age 50 and over control 50 percent of all discretionaryincome. AARP…

A: a. It is given that the sample mean is $1873 and the sample standard deviation is $550. The sample…

Q: The average of serum cholesterol levels in a group of 20 Lebanese was 210 mg/dl and the Standard…

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: Among various ethnic groups, the standard deviation of heights is known to be approximately throe…

A: Critical value: Using Excel formula “=NORM.S.INV(1-(0.05/2))”, the critical value for 95% confidence…

Q: A bank wishes to estimate the mean credit card balance owed by its customers. The population…

A:

Q: What sample size would be needed to estimate the average body temperature of humans if you wished to…

A: Given data,E=0.1z-value at 99% confidence is Zc=2.576σ=0.6n=?

Q: In the 2018 General Social Survey, a random sample of 1666 adults in the U.S. was asked how old they…

A:

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Givenconfidence interval(c)=95%margin of error(E)=8standard deviation(σ)=10

Q: In a survey, 30 people were asked how much they spent on their child's last birthday gift. The…

A:

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

A: Given that, Sample size (n) = 25 Sample mean (x̄) = $41 Sample standard deviation (s) = $9 5%…

Q: In a sample of 80 light bulbs, the mean lifetime was 1217 hours with a standard deviation of 52…

A: Solution: Note: Hello! As you have posted more than 3 sub parts, we are answering the first 3…

Q: How much money does the average professional football fan spend on food at a single football game?…

A: Given information- Population standard deviation, σ = $17.50 Sample size, n = 60 Sample mean, x-bar…

Q: wish to construct a 99% confidence interval

A: Given that  Sample size (n) =14 Mean money spent (x¯ )= $145 = Sample mean  Sample standard…

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

A:

Q: It is known that the population mean for the verbal section of the SAT is 500 with a standard…

A: From the provided information, Sample size (n) = 400 Sample mean (x̅) = 511 Population standard…

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A:

Q: How large a sample should be selected to provide a 95%  confidence interval with a margin of error…

A: Given: Margin of error (E) = 8 Population standard deviation (σ) = 40 Confidence Interval = 0.95 α =…

Q: Lindvall’s Friendship Club has had members for 50 years as well as new joiners.  Lindvall pulls a…

A: Given information: The sample describes that the Lindvall Friendship Club has had members for 50…

Q: A sample of 256 managers reveals a sample mean of $45,420. The standard deviation of the sample is…

A: Given: A sample of 256 managers has a sample mean of $45,420 and a standard deviation of $2,050.…

Q: A 95% confidence interval for the mean hours freshmen spent on social media per day was calculated…

A:

Q: The average daily volume of a computer stock in 2011 was μ=35.1 million​ shares, according to a…

A:

Q: In a study it was found out of a random sample of 30 there was a sample standard deviation of 2.4.…

A:

Q: How much money does the average professional football fan spend on food at a single football game?…

A:

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A:

Q: A random sample of 16 employees taken from the management level of the company gives a mean monthly…

A: Given that  Sample size = 16 , Mean = 17000 , Standard deviation = 5500

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Given information: Confidence interval(c)= 95%. Margin of error(E)=7. Population standard…

Q: A sample data set, n = 115, shows human body temperatures with a mean of 99.6ºF. If the standard…

A: Given Data: n=115x¯=99.6σ=0.75   z-value corresponding to 99% Confidence Interval=2.576

Q: The population standard deviation for the height of college basketball players is 3 inches. If we…

A: Given information: Population standard deviation for the height of college basketball players σ=3…

Q: In a recent sample of 89 used cars sales costs, the sample mean was $6,225 with a standard deviation…

A: Given, Sample size = 89 Sample mean = 6225 Sample standard deviation = 3151   Since the population…

Q: The 92 million Americans of age 50 and over control 50 percent of all discretionaryincome. AARP…

A: Given: n=80σ=550x=1873 (a) At 95% C.I, the margin of error will be as follows: 95% C.I or 0.95Then,…

Q: The determination of copper in a seawater sample gave a mean value of 77.81 mg/L and a ndard…

A: Critical value: The confidence level is 100*(1–α)% = 95%. The critical value is obtained as 1.96…

Q: In a previous example, your sample consisted of 83 respondents. Suppose you doubled your sample size…

A: Introduction -  Confidence interval  CI=x±zsn