1. A sample of 60 Grade 9 students' ages was obtained to estimate the mean age of all Grade 9 students. mean is 15.3 years  and the population variance is 16. 1.A Find the 99% confidence interval for μ? a. 17.59 - 19.63 b. 15.79 - 16.36 c. 15.97 - 16.63 d. none of the above 1.B Find the 95% confidence interval for μ? a. 15.56 - 17.23 b. 14.92 - 16.13 c. 14.29 - 16.31 d. none of the above.

Q: a random sample of seven cell​ phones, the mean full retail price was ​$575.00 and the standard…

A: Given, Mean (x-) = 575 Standard deviation (s) = 226 c= 99% = 0.99

Q: Suppose you take a sample of size 60 from a Normal distribution with  population mean (mu) 412 and…

A: The mean is 412 and the population standard deviation is 18.

Q: Construct the indicated confidence interval for the difference between the two population means.…

A:

Q: Find a 90% confidence interval for the population standard deviation if you are given a sample of 10…

A: Given data : sample size,n = 10 df=n-1= 9 sample standard deviation,s= 3.0…

Q: A 95% confidence interval for a population mean was reported to be 134 to 142.  If the population…

A:

Q: In developing an interval estimate for a population mean, a sample of 50 observations was used. The…

A: [Note: “Since you have posted multiple questions, we will provide the solution only to the first…

Q: Suppose heights, in inches, of orangutans are normally distributed and have a known population…

A: Confidence Interval:Confidence interval is the interval estimate of the population parameter. It is…

Q: Find the 2-decimal answers for a 96% confidence interval if a samle of 56 students have a mean…

A: From the provided information, Population standard deviation (σ) = 2.35 Sample mean (x̄) = 51 Sample…

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: 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: 21. What is the 98% confidence interval for the difference in population means, p1 – p2 given the…

A: Let p1 denotes the population proportion for population 1 and p2 denotes the population proportion…

Q: Suppose you wanted to take another sample of dogs to find a 90% confidence interval of young dogs to…

A:

Q: interested in the true mean age for Winter Foothill College students. Let X = the age of a Winter…

A: Given : Sample Size , n= 25 Sample Mean , x̄ =30.4 population standard deviation ,…

Q: a. Find a 95% confidence interval for u. b. Find a 90% confidence interval for u. H. c. Find a 99%…

A:

Q: 2. A confidence interval for the population mean based on 16 individuals has been reporte to (34.14,…

A:

Q: At a college, a popular achievement test is used for advanced college placement. Counselors selected…

A:

Q: The scores of a certain population on the Wechsler Intelligence Scale for children (WISC) are…

A:

Q: a sample of n=16 scores has mean of M=58 with SS=540. Use the sample to construct the 95% confidence…

A: Solution: From the given information, n=16, M=58 and SS=540.

Q: Based on the sample, make a point estimate of the population mean anxiety score. 2. Make…

A:

Q: Let us suppose we have data on the absorbency of paper towels that were produced by two different…

A: For process 1  Sample size n1=10 meanx1=180 Standard deviations1=15 For process 2  Sample size n2=4…

Q: Suppose a certain species of bird has an average weight of sample mean=3.45 grams. Based on previous…

A: Given information: Sample mean = 3.45 grams The weights of the birds follow a normal distribution.…

Q: Find a 90% confidence interval for the population mean age of the Smurfs if a sample of 52 smurfs…

A: It is given that, There is a random sample of size 52 and has a mean of 49.7 and the standard…

Q: when the population standard deviation is 12 points.   b. when the population standard deviation is…

A: It is given that  Sample mean = 68 Sample size = 36 Confidence level = 95%   Note: According to…

Q: Suppose scores on exams in Biology are normally distributed with an unknown population mean and a…

A: given data σ = 5.4n = 60 x¯ = 81find 90% ci for μ = ?

Q: Mrs. Gallas wanted to estimate the average weight of an Oreo cookie to determine if the average…

A: given that,point estimate = sample mean, x =11.1921standard deviation, s =0.0817sample size, n =30

Q: 3. A sample of 8 adult elephants had an average weight of 12,300 pounds. The standard deviation for…

A:

Q: to survive a heart attack, the researchers reported the ages of the two groups they examined. The…

A: Given: Without cardiac disease Sample size n1=2397Sample mean x¯1=69.8Sample standard deviation s…

Q: Suppose a 90% confidence interval for the population mean (µ) is given by  (132.6, 158.2).  Find the…

A: Given Confidence interval is  Lower limit=132.6 Upper limit=158.2 Point estimate x=?

Q: Find a 99% confidence interval for μ.

A: The sample size is n = 7 Sample mean = 46.14 Sample SD s = 1.19 At 99% confidence level and df = (n…

Q: A sample with 45 observations is taken. The mean is found to be 25, while the population standard…

A:

Q: A medical doctor who wanted to study the heights of adult men and women took a random sample of 150…

A: Given n1=150 n2=120

Q: Suppose we gather a random sample of 20 data points. Assume the population standard deviation is 11.…

A: Given,   Sample size = 20 Sample mean = 23 Population standard deviation = 11   Since the population…

Q: A random sample of 100 is taken from a population. The sample is found to have a mean of 76.0 and…

A:

Q: The slope of a regression line is 0.8, and the standard error of the slope is 0.3. The sample used…

A:

Q: 7.2.14 In a test of the effectiveness of garlic for lowering cholesterol, 43 subjects were treated…

A: Sample mean = x̅ = 4.7 Sample size = n = 43 Sample S.D = s = 15.8 Standard Error = s/√n  =…

Q: The mean IQ for the entire population in any age group is known to be 100 with a standard deviation…

A: The random variable IQ follows normal distribution. The population standard deviation is 15. The…

Q: Calculate the 95% confidence interval and the 99% confidence interval for a sample of 81 where the…

A: Given : Sample Size, n = 81 Sample Mean, x̄ = 50 sample standard…

Q: A study found that a 95% confidence interval for the mean μ of a particular population was computed…

A: Given, 95% confidence interval 10 ± 4  Sample size  = 1200         To write the conclusion regarding…

Q: 95% confidence interval of the true mean of the noise levels in the operating rooms

A: Sample size = 23 Mean noise level = 37.9 decibels  Standard deviation = 7.6 decibels  For 95%…

Q: Mrs. Gallas wanted to estimate the average weight of an Oreo cookie to determine if the average…

A: In statistical inference, there are two types of estimation,  Point estimation and Interval…

Q: You have taken 12 observations from normally distributed data that is known to have a population…

A: