A general achievement test is standardized so that eighth graders should average 77.2 with a standard deviation of 4.8. If 35 eighth graders from a certain school district average 79.5 on the test, does this substantiate the claim that the eighth graders in this district are above average? Use the level of significance alpha = 0.05 and assume that the data constitute a random sample. State the hypotheses and conclusion.

Q: It is believed that the average grade on an English essay in a particular school system for females…

A: we have given that  n1=12 , xbar1=82 ,s1=3 and n2=8 ,xbar2=76 ,s2=4  mu1=female   ,mu2=male

Q: Nafuz manages the credit department for a grocery store chain in the province, and would like to…

A: From the given information Null Hypothesis: H0: The mean monthly balance of credit card holders is…

Q: The former manager of the coffee shop in a local bookstore claimed that the mean daily sales were…

A: Givensample size(n)=11Mean(x)=2956.14standard deviation(s)=370α=0.01

Q: In a random sample of twelve ​people, the mean driving distance to work was 21.5 miles and the…

A: Solution

Q: it is claimed that personal vehicle is driven 24500 km per year. would you agree with this claim if…

A:

Q: A student at a four-year college claims that enrollment at four–year colleges is higher than at…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub- parts for…

Q: A sample of 510 homes for sale in ABC City showed a man asking price of $258,000, but the city…

A: Given Information :  A sample of 510 homes for sale in ABC City showed a man asking price of…

Q: A survey claims that the average cost of a hotel room in Regina is $99. To test the claim, a…

A: GivenMean(x)=103.50standard deviation(s)=9.20sample size(n)=38α=0.05

Q: In a random sample of ten ​people, the mean driving distance to work was 18.1 miles and the standard…

A:

Q: If the population standard deviation is 10, how large a sample is necessary to have a standard error…

A: The population standard deviation is 10 and the standard error is less than 5 points.

Q: The Transportation Security Administration would like to compare the average amount of time it takes…

A: Note: Hi there! Thank you for posting the question. To avoid the plagiarism issue we have used the…

Q: In a random sample of ten people, the mean driving distance to work was 21.8 miles and the standard…

A: Given,sample size(n)=10mean(x)=21.8standard deviation(σ)=6.4α=1-0.99=0.01α2=0.005degrees of…

Q: According to the National Association of Home Builders, the average cost of building a home in the…

A: Null hypothesis: Null hypothesis is the statement about parameter of population. Alternative…

Q: A dean at BUC claims that the average age of the students in this college is 25. A random sample of…

A: Note: Thank you for the question. Since it is not mentioned the standard deviation is population…

Q: A travel analyst claims that the mean of the room rates for two adults at three-star hotels in Salt…

A: When the population standard deviation is known (i.e., given σ = 30) one sample z-test is…

Q: According to the Vivino website, suppose the mean price for a bottle of red wine that scores 4.0 or…

A: mu = 32.48 xbar = 30.15 s = 12 n = 61

Q: According to the Vivino website, suppose the mean price for a bottle of red wine that scores 4.0 or…

A: Given: Population mean μ = $32.48 Sample size n = 59 Sample mean X = $30.15 Sample standard…

Q: The mean cost of a new Sport Utility Vehicle (SUV) has been found to be $42,500 with a standard…

A:

Q: The average student-loan debt is reported to be $25,235. A student believes that the student-loan…

A: Note : According to our guidelines we are solving only first three sub-parts of a question and the…

Q: The administrator at your local hospital states that on weekends the average wait time for emergency…

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

Q: A manufacturer claims that a particular automobile model will get 50 miles per gallon on the…

A: μ=50 miles per gallon n = 30 cars x¯=2.3 miles per gallon σ=49 miles per gallon Let the level of…

Q: A random sample of 101 body temperatures with has a mean of 98.20°F and a standard deviation of…

A: Given data, n=101 mean=98.20 sd=0.62

Q: The administrator at your local hospital states that on weekends the average wait time for emergency…

A: The one sample t-test has four main assumptions: The dependent variable must be continuous…

Q: In a random sample of ten ​people, the mean driving distance to work was 23.2 miles and the standard…

A: Provided information is ; Sample size(n) =10  Mean(μ) = 23.2 Sample standard deviation(s) = 5.3…

Q: Lydia Hayward is an external research consultant hired by FirstCard, a major credit card company, to…

A: Correct Option D) This is a right-tailed test because the alternative hypothesis is…

Q: A random sample of 50 public school teachers in Georgia had a mean annual salary of $48,300. Assume…

A: The hypotheses for the test is given below.Null hypothesis:H0: µ = $50,000Alternative hypothesis:H1:…

Q: The high school athletic director is asked if football players are doing as well academically as the…

A: Given : population mean , u = 3.10  population standard deviation, σ = 0.54

Q: A real estate company appraised the market value of 20 homes in a regional suburb in Western…

A:

Q: A sample of 350 homes for sale in ABC City showed a mean asking price of $247,000, but the city…

A: Introduction: Denote μ as the true mean asking price of homes for sale in ABC City The claim by the…

Q: Compute for the appropriate sample size if the margin of error is 16, with a sample standard…

A: GivenMargin of error(E)=16standard deviation(σ)=49confidence level=85%

Q: A manufacturer claims that a particular automobile will get at least 50 miles per gallon on the…

A: Solution: Given: Sample size: n = 30 cars Population standard deviation: σ = 2.3 miles per gallon…

Q: The average salary in this city is $48,800. Is the average less for single people? 57 randomly…

A: To test the given  claim

Q: The sample mean weight of 65 adult African elephants was measured to be 14,325.62 pounds, with a…

A: Answer:-  Option C is the right option.

Q: A hospital president claims that the average Salary of registered nurses at her hospital is more…

A:

Q: In a random sample of eight cell​ phones, the mean full retail price was ​$431.50 and the standard…

A:

Q: A fast-food franchiser is considering building a restaurant at a certain location. According to a…

A: Denote μ as the population mean number of pedestrians passing the location per hour.   It is needed…

Q: A sample of 106 body temperatures was found to have a mean of 98.20and a standard deviation of 0.62.…

A: Given that, A sample of 106 body temperatures was found to have a mean of 98.20and a standard…

Q: A sample of 150 homes for sale in ABC City showed a mean asking price of $233,000, but the city…

A: Given, Sample size = 150 Sample mean = 233000 Population standard deviation = 11000   Under the…

Q: A random sample of 100 pumpkins is obtained and the mean circumference is found to be 40.5 cm.…

A: The summary of statistics is, The type of test is two tailed test

Q: According to the Vivino website, suppose the mean price for a bottle of red wine that scores 4.0 or…

A:

Q: In a recent sample of 89 used cars sales costs, the sample mean was $6,225 with a standard deviation…

A: Given, Sample size = 89 Sample mean = 6225 Sample standard deviation = 3151   Since the population…

Q: According to the Vivino website, suppose the mean price for a bottle of red wine that scores 4.0 or…

A: Given: μ=32.48n=64x¯=30.15s=12

Q: In a random sample of eleven ​people, the mean driving distance to work was 18.1 miles and the…

A: Given information Sample size (n) = 11 Sample mean x̅ = 18.1 miles Standard deviation (s) = 7.6…

Q: calculate (formula /values) The test statistic and the associated P value range from the table…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: The director of vehicle maintenance for a large mass transportation authority wants to know the…

A: In this question, we have a sample of 100 tires and mean life of tire is 20,000 miles and standard…

Q: A travel analyst claims that the mean price of a round trip flight from New York City to Los Angeles…

A: Solution:

Q: According to an article in Good Housekeeping, a 128-lb woman who walks for 30 minutes four times a…

A: Given, Sample size = 35 Sample mean = 9.1 Sample standard deviation = 5   Set up the null and the…

Q: According to the Vivino website, suppose the mean price for a bottle of red wine that scores 4.0 or…

A: (a) Let μ denotes the population mean price in Providence for a bottle of red wine that scores 4.0…

Q: A cigarette manufacturer claims that its brand of cigarette contains on the average 5mg of tar and…

A: Given : n=25 , X-bar=6  , s=2 , μ0=5  Assume that , α=0.05 Here , we want to test the cigarette…