What is the 95% confidence interval for the mean number of hours spent by senior high school students using Google services per day? A sample of 20 produced a mean of 10 hours and a standard deviation of 3 hours. O a. 8.56 to 11.44 O b. 8.59 to 11.40 Oc. 8.60 to 11.39 O d. 8.60 to 11.40

Q: If a sample has a mean of 250 and a standard deviation of 15, what is the value in the data set that…

A:

Q: Find a 90%confidence intervalfor thế populadofn stan

A: (1-α)100% confidence interval for σ2 is                                                        First…

Q: If a sample has a mean of 150 and a standard deviation of 9, what is the value in the data set that…

A: Given,mean(μ)=150standard deviation(σ)=9Z-score=1.58

Q: The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants…

A: Sample points are 9.0,7.3,6.0,8.8,6.8,8.4,6.6. Sample size = n = 7.

Q: This aue A survey found that women's heights are normally distributed with mean 63.5 in and standard…

A: Given Mean=63.5 Standard deviations=2.5

Q: In a normally distributed data set with a mean of 22 and a standard deviation of 4.1, what…

A: According to the given information, we know that The distribution is normal. Mean = 22 Standard…

Q: A report said that the average blood pressure is  130.71  for a sample of  37  white males aged  35…

A:

Q: The police lieutenant in charge of the traffic division has reviewed the number of traffic citations…

A: Standard deviation= √E(X2)-(E(X))2 E(X)=( summation Xi)/n E(X2) = (summation Xi2)/n Here n= 19

Q: Full-time college students report spending a mean of 29 hours per week on academic​ activities, both…

A: Givenmean(μ)=29standard deviation(σ)=4sample size(n)=64

Q: community college Math instructor feels that the average number of units students enroll in each…

A: Hypothesis testing  Hypothesis testing is conducted for the parameters of the population like…

Q: A sample of 64 was taken from a population, with the mean of the sample being 25 and the standard…

A: It is given that  Sample mean = 25 Sample standard deviation = 2 Sample size = 64 Confidence level =…

Q: In order to estimate the average time spent on the computer terminals per student at a local…

A: The standard error of the mean is given by

Q: The hourly cost to hire a handyman in a particular city is normally distributed with mean $40 and…

A: Solution: 19. Let X be the hourly cost to hire a handyman in a particular city. From the given…

Q: A study of 64 bolts of carpet showed that their average length was 75 yards. The standard deviation…

A:

Q: Suppose that another sample of resting heart rates for five Math students was obtained: 72, 68, 66,…

A: From the given data we want to know the data value .

Q: The mean time taken to design a house plan by 40 architects was found to be 19 hours with a standard…

A: Step 1:Given data :Sample size n=40degrees of freedom df=40−1=39Sample mean xˉ=19Sample standard…

Q: mean length of 25 cm. Because of the variability in the manufacturing​ process, the lengths of the…

A: Population mean μ =25 Population standard deviation =0.08

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

A: We have given that  Sample size=n=26 Mean=Xbar=50.9 Standard deviation=S=9.4 90% confidence interval…

Q: For a random sample of 55 overweight men, the mean of the number of pounds that they were overweight…

A: Given data, n=55 μ=32σ=4.1Point estimate μx=?

Q: Kennedy High School reported that the mean score on an end of semester physics exam wass 508 with a…

A: Given, Mean score μ=508Standard deviation σ=121Sample size n=200

Q: A study of 81 bolts of carpet showed that their average length was 77.5 yards. The standard…

A:

Q: A study of 96 bolts of carpet showed that their average length was 77.5 yards. The standard…

A: GivenMean(x)=77.5sample size(n)=96standard deviation(s)=1.6α=1-0.99=0.01α2=0.005zα2=z0.05=2.58

Q: Find the 90% confidence interval for the standard deviation of the lengths of pipes if a sample of…

A: given data s = 10.2 n = 22 90% CI for σ = ? α = 1 - 0.90 = 0.10df = n - 1 = 21χ2L = χ21-α2,n-1…

Q: You have just taken ownership of a pizza shop. The previous owner told you that you would save money…

A: Hi! Thank you for the question As per the honor code, We’ll answer the first question since the…

Q: A large oil company is studying the number of gallons of gasoline purchased per customer at…

A: Given : A large oil company is studying the number of gallons of gasoline purchased per customer at…

Q: A researcher is interested in finding a 98% confidence interval for the mean number of times per day…

A:

Q: The standard deviation of quiz scores in Math 22 of EE courses is 8.6. A professor believes this…

A: The provided information is n=20 σ=8.6 s=6.9 The level of significance is  α=0.05 The null and…

Q: A study of 96 bolts of carpet showed that their average length was 77.5 yards. The standard…

A:

Q: A hypothesis regarding the weight of newborn infants at a community hospital is that the mean is 7.1…

A: Given n=7 X=6.1, 8.1, 9.1, 10.1, 7.1, 11.1, and 12.1

Q: The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a…

A: Given that the mean of 70 minutes and a standard deviation of 10 minutes. Suppose the students are…

Q: An exam score has a mean of 78 and a standard deviation of 9. What is the Z-score for an exam score…

A: GivenMean(μ)=78standard deviation(σ)=9

Q: Average adult Americans are about one inch taller but nearly a whopping 25 pounds heavier than they…

A: According to the given information in this question We need to apply z test for one population mean

Q: An instructor claims that the average number of hours needed to study for a final exam in order to…

A: The significance test for single mean is tested using the z test, if the population standard…

Q: A survey found that the average hotel room in New Orleans is $88.42 and the average room rate in…

A:

Q: d. For the 33 people, find the probability that the average age that chey learned to walk is betwe…

A: We have given that  The age that children learn to walk is normally distributed with mean 11 months…

Q: The daily income of bank auditors in SSS Commercial Bank is normally distributed with a mean of ₱675…

A: Given data,μ=675σ=50

Q: The manager at a drive through has implemented a new process and wants to check if the new drive…

A: