How many computers? In a simple random sample of 125 households, the sample mean number of personal computers was 1.56. Assume the population standard deviation is σ=0.71. Part A answer: 95%confidence interval for the mean number of personal computers is 1.4355<μ<1.6845 (b) If the sample size were 160 rather than 125, would the margin of error be larger or smaller than the result in part (a)? Explain. The margin of error would be (Choose one:Larger or smaller) , since (Choose one:a increase or an decrease) in the sample size will (Choose one:increase or decrese) the standard error.

Q: I want to create a 95% confidence interval for the average price of coffee in West Virginia. I have…

A:

Q: Find a 95% confidence interval for a mean, µ, where n = 324, x̄ = 2.7, s = .91, and se = .06.

A: Given: n = 324, x̄ = 2.7, s = .91, se = .06.

Q: magine that you want to estimate the average home value in your neighborhood.   The standard…

A: standard deviation  σ = $100,000.the maximum margin of error E=$45,000.

Q: Find the sample size required to estimate the mean IQ of all  college students. Assume we want a 99…

A: From the given information, σ=15 and E=2.

Q: A simple random sample of 100 items resulted in a sample mean of 80 . The population standard…

A: Obtain the 95% confidence interval for the population mean.   The 95% confidence interval for the…

Q: A sample of the reading scores of 30 fifth graders has mean of 62.the standard deviation of the…

A: Given,   Sample size = 30 Sample mean = 62 Population standard deviation = 15   The objective is to…

Q: A professor is trying to find the average exam grade in his class. The sample mean should be within…

A: Determine the value of sample size n. The value of sample size n is obtained as shown below: Use…

Q: The population distribution is normally distributed and has a mean of 13.6 and a standard deviation…

A: Normal distribution is a continuous distribution which has many real life applications. Normal curve…

Q: SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested…

A: Critical value: The value of α is 0.05 for 95% confidence level. Using excel formula…

Q: SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested…

A:

Q: na random sample of twelve people, the mean driving distance to Work Was 24. ormally distributed and…

A: Given Xbar=24.7 S=5.5

Q: What sample size is needed to estimate the mean white cell blood count ( in cells per microliter)…

A: From the provided information, Population standard deviation (σ) = 2.5 Confidence level = 90% Margin…

Q: You are interested in estimating the the mean weight of the local adult population of female…

A: Given that the population standard deviation is 17 pounds. Confidence level is 96% Margin of error…

Q: (c) If the confidence levels were 98% rather than 80%, would the margin of error be larger or…

A: Given Sample size, n=175 Sample mean, x¯=2.94Population sd,σ=0.45

Q: You are interested in estimating the the mean weight of the local adult population of female…

A:

Q: A study of 77 golfers showed that their average score on a particular course was 93. The st.dev. of…

A: 1). Assume, μ  be the population mean golfers score. x be the random variable representing the…

Q: The distribution of study times for first year students follows a Normal distribution with standard…

A: Given: n=325, σ = 56 minutes, x¯= 184 minutes.

Q: The amount of trash generated by US households (in lbs per day) is Normally distributed. You take a…

A: Given,   Sample size = 10 Sample mean = 10.91 Sample standard deviation = 4.736   The objective is…

Q: Last Wednesday, a random sample of 16 students were surveyed to find how long it takes to walk from…

A:

Q: The amount of trash generated by US households (in lbs per day) is Normally distributed. You take a…

A:

Q: Provide 90% and 95% confidence intervals for the population mean number of weekly customer contacts…

A: Given n=55 x¯=18.5s=5.2

Q: The distribution of study times for first year students follows a Normal distribution with standard…

A:

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated. The…

A:

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.