A car manufacturer claims that a new model QX has an average fuel efficiency µ =35 miles per gallon on the highway, and a standard deviation σ=5. The American Automobile Association randomly selects 16 new QXs and measures their fuel efficiency at 33 miles per gallon. Is the car manufacturer truthful in advertising QX’s fuel efficiency as being 35 miles per gallon, assuming =0.05?

Q: A scrap metal dealer claims that the mean of his sales is “no more than $80,” but an Internal…

A: Given that, Mean= 91 Standard deviation, sigma= 21 Sample size, n=20 Hypothesis,  Ho:  the agent’s…

Q: The physical plant at the main campus of a large state university receives daily requests to replace…

A: We want to find the probability (%) P(49<X<79)= ?  X~N(μ=49,σ2=102)

Q: A survey of nonprofit organizations showed that online fundraising has increased in the past year.…

A: Given that Sample size n = 50 Sample mean,M = 29 Sample SD, s = 7 The critical value of t at 90%…

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Given that, The distribution of the number of phone calls answered each day, Mean = 48 Standard…

Q: A mortgage broker is offering home mortgages at a rate of 9.5%, but the broker is fearful that this…

A: Given Information: Hypothesized value of population mean is 9.5% Sample size n=40 Sample mean…

Q: According to the Annual survey of drugs expenditure in country X, the annual expenditure for…

A: Given, x=745σ=300n=60α=1-0.99=0.01 i). The hypothesis to be tested is obtained as-…

Q: A job placement director claims that the average starting salary for nurse is $25000. A sample of 15…

A: The null and the alternative hypothesis are based on the population mean: H0 : μ = 25000H1 : μ ≠…

Q: On their website, a property management company states that the mean monthly rent for apartments on…

A: Dear students as per guidelines we answer the first three subparts only when multiple different…

Q: On their website, a property management company states that the mean monthly rent for apartments on…

A: The objective is to state null and alternative hypothesis and find the value of test statistic for…

Q: To compare the battery life of Duracell versus Energizer batteries, a sample of 140 Duracell…

A: Given: n1 = 140 X1 = 345 S1 = 95 n2 = 125 X2 = 280 S2 = 86 α = 0.01 Formula Used: Test-statistic t =…

Q: A factory manufacturing light emitting diode LED bulbs claims that their light bulbs last for 50,000…

A: A confidence interval is an inference method which gives the range of plausible values of the…

Q: In a sample of 80 business trips taken by employees in the HR department, a company finds that the…

A: The level of significance is given by 5% = 0.05 And the p-value is 0.027

Q: In a certain city, the average 20- to 29-year old man is 69.8 inches tall, with a standard deviation…

A:

Q: A researcher is examining the gradate student lifestyle at UNCG, and wants to find out how many…

A: (a) The sample size is, n = 144; the sample standard deviation is, s = 3. Since the population…

Q: Is there a difference in the weights of contents in a can of Diet Coke versus a regular can of Coke?…

A: Solution:Null and alternative hypotheses:Null hypothesis: µ1−µ2 = 0Alternative hypothesis: µ1−µ2 ≠…

Q: A researcher claims that the stomachs of blue crabs from Location A contain more fish than the…

A: The given researcher claims is that the stomachs of blue crabs from Location A contains more fish…

Q: The local police department attempted to estimate the average vehicle speed along a strip of the…

A: Let X denote the average vehicle speed. Given, X~N36, 16 average speed of n = 4 cars is measured to…

Q: A manufacturer of car batteries claims that the life of the company’s batteries is approximately…

A: Hypothesis concerning a population variance; Suppose y1.y2........yn are the random sample from…

Q: h individual lines at its various windows, a post office finds that the standard deviation for…

A: The SD for waiting times of customers is 3.97 minutes;σ=3.97 A random sample of 14 customers with…

Q: The physical plant at the main campus of a large state university receives daily requests to replace…

A: Given, The distribution of the number of daily requests is bell shaped with mean of 52 and standard…

Q: a factory manufacturing light emitting diode bulbs claims that their light ba blast to 50,000 hours…

A: Given: μ=50,000 n=50x¯=40,000 s=1000 The significance level is taken as 0.05.

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Given: μ=58 & σ = 9  Percentage of calls between 25 and 79 can be obtained by the probability…

Q: In a certain​ city, the average​ 20- to​ 29-year old man is 72.5 inches​ tall, with a standard…

A: Given that, In a certain​ city, the average​ 20- to​ 29-year old man is 72.5 inches​ tall, with a…

Q: A recent report indicates that 2-year-old children from well-educated suburban families watched an…

A: It is given that the mean is 60 and standard deviation is 25.

Q: Nationwide, the average waiting time until a electric utility customer service representative…

A:

Q: The physical plant at the main campus of a large state university receives daily requests to replace…

A: Given a mean of 51 and a standard deviation of 4.

Q: a florist ahs a floral shop  in miami  and anotherin san diego. Teh miami shop has a mean daily…

A: We need to compute the z-score to find out which store had the better sales.

Q: In a certain city, the average 20- to 29-year old man is 69.4 inches tall, with a standard deviation…

A: Given: For Man:      Avg = 69.4      SD = 3.2 For Women:       Avg = 64.3        SD = 3.9 Who is…

Q: The average income in Boston is 6200 witha standard deviation of 8000, while the average income in…

A: GivenFor BostonMean(μ)=6200standard deviation(σ)=8000For chicagoMean(μ)=48000standard…

Q: In a certain city, the average 20- to 29-year old man is 69.6 inches tall, with a standard deviation…

A:

Q: In a certain city, the average 20- to 29-year old man is 69.8 inches tall, with a standard deviation…

A: Mean (man)=69.8Standard deviation (man)=3.0Mean (woman)=64.1Standard deviation (woman)=3.9

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Given Information: Mean μ=48 Standard deviation σ=7 Using empirical rule, to find the approximate…

Q: Suppose in a city of 100,000 residents, a survey was conducted with size of 1650. If Forty-two…

A: GivenThe sample size = 1650The percentage of population opposes the new taxes for the geothermal…

Q: certain​ city, the average​ 20- to​ 29-year old man is 69.4 inches​ tall, with a standard deviation…

A: Given: For females Mean μf=64.5 Standard deviation σf=3.8 Observed value (Xf) = 70 For males Mean…

Q: In an effort to make a healthier product, the Oriental Spice Sauce company has reduced the amount of…

A:

Q: A CHED commissioner claims that the average cost of one year's tuition for all private colleges in…

A: Given that sample size n = 15 Sample mean = 31080 Sample SD = 400 Level of significance = 0.01

Q: AARP claims the average annual expenditure for Americans age 50+ on restaurant food in 2008 was…

A: Given: n=32, μ=$2130, x=$1945, σ=$800 The hypothesis is, H0:μ=$2130Ha:μ<$2130 This corresponds to…

Q: A manufacturer of mugs packages them in boxes of 100. It is shown that, on the average, mugs weigh…

A: Mean 100 standard deviation 5 n  100 N 10000 Hypothesis testing involves large samples is…

Q: A state school administrator says that the standard deviation Or SAI critical reading test scores is…

A: Given Population standard deviations σ=114, sample size n=19, sample standard deviations s=143…

Q: A random sample of 100 households was selected as part of a study on electricity usage, and the…

A: It is an important part of statistics. It is widely used.

Q: In a certain​ city, the average​ 20- to​ 29-year old man is 72.5 inches​ tall, with a standard…

A: 72.5 3.1 75 64.3 3.8 70

Q: 1. A particular brand of tires claims that its deluxe tire averages at least 55,000 miles before it…

A: Given : n(sample size)=45 Alpha(level of sig.)=0.05

Q: In a particular city, the average annual salary for secretaries is $28,000.   A sample of 50…

A:

Q: According to the Annual Survey of Drug expenditure in country X, the annual expenditure for…

A: Hey, since there are multiple subparts posted, we will answer first three subparts. If you want any…

Q: A local Chamber of commerce Claims that the mean family income in aſcity is $12,250 An economist…

A: The one-sample z-test is used to test whether the mean of a population is greater than, less than,…

Q: The CEO of a large financial institution claims that, on average, their clients invest more than R95…

A: Null Hypothesis: H0: The average invest is not more than 95,000 Alternative Hypothesis: H1: The…

Q: An auto manufacturer claims that its new 4-cylinder Hybrid auto with manual shift averages 50 mpg…

A: Computation of test statistic value: The population standard deviation is unknown. Thus, in order to…

Q: A radio station claims that the amount of advertising per hour of broadcast time has an average of…

A: It is given that, A radio claims that the amount of advertising per hour of broadcast time has an…

Q: A marine biologist claims that a harbor seal's average dive time is at least 5.8 minutes. A random…

A: