The owner of a new car dealership claims the average number of days it takes his dealership to sell aChevrolet Aveo is 44 days. A random sample of 50 cars had a mean time on the dealer’s lot of 54 days.Assume the population standard deviation to be 6.0 days. Find the 95% confidence interval estimate of thepopulation mean. State the Margin of Error, Best Point Estimate and Include the writtenstatement?

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

A: a.   The best estimate for the population mean credit card balance owned by the bank’s customers is…

Q: The time that a shopper spends in the grocery store is normallydistributed, with a mean of 45…

A: Given Information: The time that a shopper spends in the grocery store is normally distributed with…

Q: In a random sample of 40 visitors to a certain theme park, it was determined that the mean amount of…

A:

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

A:

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

A:

Q: In a random sample of six cell​ phones, the mean full retail price was ​$482.50 and the standard…

A: Confidence interval: Since the population standard deviation is unknown and the sample size is…

Q: The operations manager of a large production plant would like to estimate the average amount of time…

A:

Q: In a random sample of ten ​people, the mean driving distance to work was 19.2 miles and the…

A:

Q: The operations manager of a large production plant would like to estimate the average amount of time…

A: The standard deviation is 7 minutes; σ=7minutes Margin of error=22 seconds Confidence level is…

Q: A financial institution wishes to estimate the mean balances owed by its credit card customers. The…

A:

Q: An industrial engineer would like to determine whether there are more units produced on the night…

A: The test statistic is, Thus, the test statistic is -1.30. The level of significance is 0.05. From…

Q: In a random sample of 8 cell phones,the mean full retail price was $405.00 and the standard…

A:

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: If the manager of a bottled water distributor wants to​ estimate, with 90​% confidence, the mean…

A: According to the provided information,

Q: The operations manager of a large production plant would like to estimate the average amount of time…

A: Given information- Population standard deviation, σ = 7 minutes So, in seconds- Population standard…

Q: In a random sample of seven aerospace engineers, the mean monthly income was $7322 and the standard…

A: Given,sample;  n=7mean;    x¯=7322 $Standard deviation; s=343 $at confidence level 95% ,…

Q: The manager of a fast-food restaurant wishes to estimate the mean waiting time customers spend at…

A: It is given that the sample size is n=56. The sample mean waiting time is x¯=6.35. The sample…

Q: The operation manager of a large production plant would like to estimate the average amount of time…

A:

Q: An industrial engineer would like to determine whether there are more units produced on the night…

A: When the given sample size is more than 30, then we say that it is a large sample. In the large…

Q: If the manager of a bottled water distributor wants to​ estimate, with 99​% ​confidence, the mean…

A:

Q: The Indian River County Health Department needs to estimate the proportion of county residents with…

A: It is given that the sample size (n) is 1507 and x is 672.

Q: In a survey, 19 people were asked how much they spent on their child's last birthday gift. The…

A: From the given information, there are 19 people with the sample mean is $49 and the sample standard…

Q: The Florida Department of Transportation (FDOT) would like to estimate the average speed of vehicles…

A: For the given data s..d =7,alpha=0.1 M.E =? C.I =?

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 Population standard deviation (σ) = $5…

Q: 900 students were surveyed and had an average GPA of 2.7 with a standard deviation of 0.4. Calculate…

A: Given data,n=900Mean μ=2.7sd σ=0.4Z-value at 95% confidence is Zc=1.96 Calculate the margin of…

Q: A business school placement director wants to estimate the mean annual salaries 5 years after…

A: Given: Sample size (n) = 25 Sample mean x¯ = 42740     Sample standard deviation (s) = 4780…

Q: A survey of first time homeowners found that the sample mean annual income was $53,000. Assume that…

A:

Q: Construct a 95% confidence interval for the population mean, μ. Assume the population has a normal…

A: Construction of the test statisticXi~Nμ , O2 , i =cn , independently⇒ x  ~N μ σ2n n-1S2σ2 ~ Xn-12…

Q: A survey of 1,917 cell phone users in May 2010 asked "on an average day, about how many cell phone…

A: #  Given,  n=1917     μ=13.10      &    σ=10.2a  standard  error=σn=10.21917=0.23296

Q: The operations manager of a large production plant would like to estimate the average amount of time…

A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…

Q: A college would like to estimate the proportion of its students that work full-time while going to…

A: A college would like to estimate the proportion of its students that work full-time while going to…

Q: The operations manager of a large production plant would like to estimate the average amount of time…

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 random sample of six ​people, the mean driving distance to work was 24.3 miles and the…

A:

Q: It is no surprise that the US has the highest calorie intake of any country in the world. Suppose a…

A:

Q: To decide what personnel requirements should be enforced, a hospital manager wants to estimate the…

A:

Q: The operations manager of a large production plant would like to estimate the average amount of time…

A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…

Q: In a random sample of seven cell​ phones, the mean full retail price was ​$402.50 and the standard…

A:

Q: The average weight of 31 randomly selected minivans was 4150 pounds. The sample standard deviation…

A: Given that, Mean = 4150 Standard deviation = 480 Sample size = 31 99% confidence level

Q: A bank wishes to estimate the mean balances owed by customers holding MasterCard. The population…

A: Determine the sample size n needed.   Obtain the critical value of z at the 98% confidence level.…

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: In a survey, 19 people were asked how much they spent on their child's last birthday gift. The…

A: The summary of the statistics is, The degree of freedom is, df=n-1   =19-1   =18 Critical value: By…

Q: In a survey, 41 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a random sample of ten cell phones, the mean full retail price was $554.00 and the standard…

A: Given that Sample size n = 10 Sample mean = 554.00 Sample SD = 167.00 The critical value of t at 95%…

Q: The First Federal Credit Union wants to estimate the mean amount of outstanding automobile loans.…

A: Suppose µ is the population mean amount of outstanding automobile loans.

Q: In a random sample of 25 ​people, the mean commute time to work was 30.3 minutes and the standard…

A: The sample mean is 30.3 and the standard deviation is 7.2.

Q: The average credit card debt for a recent year was $8,776. Five years earlier the average credit…

A:

Q: If  the inspection division of a county weights and measures department wants to estimate the…

A: Solution: Given information: Margin of error = E= 0.01  liters Population standard deviation= σ=…

Q: A travel analyst claims that the mean price of a round trip flight from New York City to Los Angeles…

A: Solution:

Q: The operations manager of a large production plant would like to estimate the average amount of time…

A: Given :  s = 6 minutes = 6*60 = 360 seconds E = 18 seconds Confidence level = 91%

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.