11) Randomely selected students participated in an experiment to test their ability to determine when one minute (60 seconds) has passed. Forty students yielded a a sample mean of 58.3 seconds. Assume that σ = 9.5 seconds.What is the best point estimate for the mean for all student times? Construct a 99 % confidence interval estimate for the population mean for all stu- dents. Is it likely that their mean have an estimate that is reasonably close to 60 seconds? 12) What sample size is needed to estimate the mean white blood cell count for the population of adults in the U.S? Assume you want a 99% confidence that the sample mean is within .2 of the population mean. The population standard deviation is 2.5.

Q: Researchers found that in certain counties in the country, females spend an average of 65 days in…

A: standard deviationσ=4n=36x¯=65

Q: A random sample of 21 Camden County College students had a mean age of 24 years, with a standard…

A:

Q: If the P-value is 0.003 and the level of significance , , is 0.05 in a hypothesis test for a mean,…

A: Given,p-value =0.003and  level of significance(α)=0.05

Q: In a test of the effectiveness of garlic for lowering cholesterol, 48 subjects were treated with…

A: The sample size is 48, the sample mean is 3.2 and the standard deviation is 17.8.

Q: The average wait time to get seated at a popular restaurant in the city on a Friday night is 10…

A: It is given that the p-value is 0.9396.

Q: n article in the San Jose Mercury News stated that students in the California state university…

A: (1) Given: s =1.2 The degrees of freedom is, Df =n-1=38-1=37 The critical t-value corresponds to…

Q: Construct a 95% confidence interval containing the population mean of the height of giraffes if a…

A: We want to find the 95% CI for population mean μ

Q: Suppose pizza delivery times are normally distributed. The population standard deviation is 7…

A: Given: Population standard deviation σ = 7  minutes. Sample mean X = 36 minutes. Sample size n = 20…

Q: Suppose that a garage samples 20 customers. They find the average time for there oil change is 4,029…

A: The objective of this question is to find the upper bound of the 90% confidence interval for the…

Q: How much do wild mountain lions weigh? Six adult wild mountain lions are captured and released.…

A: Given data , 68, 104, 128, 122, 60, and 64.

Q: What is the confidence interval estimate for the population mean? If the sample mean is 13 and error…

A: Given information: The sample mean is, M = 13 The error bound for the mean is, E = 3.2 It is…

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

A:

Q: using the confidence interval method, to test that population mean equals 14, a researcher obtains…

A: Solution: State the hypotheses. Null hypothesis: H0: µ=14. That is, the population mean is equal to…

Q: x¯ = Margin of error at 90% confidence level = 90% confidence interval =

A: Given: n=8 Confidence level=90% Height, X 67 66 64 75 63 67 72 71

Q: A random sample of 110 Americans was asked how many hot dogs they eat each year.  The sample mean…

A:

Q: Falling coconuts kill over 150 people each year, which is more than the number of people who die…

A: This question asks about the conditions necessary to calculate a confidence interval for the true…

Q: The heights of a random sample of 50 college students showed a mean of 68.5 inches and standard…

A:

Q: At eight different locations, paint used to mark crosswalks deteriorated after being driven over by…

A: Solution: Let X be the number of cars that would cause deterioration. From the given information,…

Q: A survey on student behavior in some major universities in Florida asked a randomly selected group…

A: Let Xi be the random variable representing the number of hours the ith student reads…

Q: To estimate u, the mean salary of full professors at American colleges and universities, you obtain…

A: Mean = 73220Standard deviation = 4400Sample size = 400

Q: Suppose that the amount of time spend by working student weekly is normally distributed with the…

A:

Q: Data of the weights of 81 pet dogs was collected. The sample mean was 30. The standard deviation is…

A: Here, T - interval is applicable ================= df = n-1

Q: An instructor gives two students portions of the same ore sample to examine by gravimetric analysis.…

A: Since you have posted multiple questions, so we will solve the first question for you. If you want…

Q: 20 TV remote controls were followed over the years to find the mean lifespan of this model. The…

A: Answer - Here  n = 20 TV remote controls were followed  over the years to find the mean…

Q: A group of 59 randomly selected students have a mean score of 29.5 with a standard deviation of 5.2…

A: It is given that n=59, x=29.5 and s=5.2. The value of z at 90% confidence interval is 1.645.

Q: A second-semester junior at a large high school wants to estimate the number of colleges a senior…

A: It is been asked to find the 99% confidence interval to estimate the true mean number of colleges…

Q: A simple random sample of 5 recently hospitalized migraine sufferers were given a new treatment; the…

A: The degrees of freedom is obtained as follows: Df=n-1    =5-1     =4 The critical-value is obtained…

Q: ample mean of 62.2 was found and a 95% confidence interval of (57.3, 67.1) was also found. What is…

A: The sample mean for the  population is 62.2  . Confidence interval is (57.3 , 67.1)

Q: A group of 49 randomly selected students has a mean age of 22.4 years and assume that the population…

A: Given information: sample size, n=49sample mean, x¯=22.4population standard deviation, σ=3.8…

Q: A retirement community takes a random sample of 25 of its residents and finds the average age is 74.…

A: 1.From the given information, the sample mean is 74, the sample standard deviation is 9.8 and the…

Q: A sample of 200 smokers were asked at what age they started smoking. The meanage was 18.3 years. The…

A: Solution:From the given information, population standard deviation value is 4.35 years and sample…

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

A:

Q: Use the sample results to approximate the margin of error and​ 95% confidence interval.   Sample…

A: Given data: Sample size, n = 64 Sample mean, x¯=69 Sample standard deviation, s=7 The degree of…

Q: The mean reading speed of a random sample of 81 adults is 320 words per minute. Find a 90%…

A: Given: n=81, x=320 and σ=45.   The value of z at 90% confidence level is 1.645. (From the z-table)

Q: According to a study of 90 truckers, a trucker drives, on average, 560 miles per day.  If the…

A:

Q: You want to estimate the mean weight of quarters in circulation. A sample of 60 quarters has a mean…

A:

Q: Suppose that a garage samples 21 customers. They find the average time for there oil change is 4,305…

A: The objective of this question is to find the 90% confidence interval of the true mean of the time…

Q: Suppose you work for the Department of Environment and National Resources (DENR). You want to…

A: Sample size n=10 Sample mean x=10.5 Sample standard deviation s=2.9 Confidence interval 95%

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.