A children’s clothing company sells hand-smocked dresses for girls. The length of one particular size of dress is designed to be 3939 inches. The company regularly tests the lengths of the garments to ensure quality control, and if the mean length is found to be significantly longer or shorter than 3939 inches, the machines must be adjusted. The most recent simple random sample of 2929 dresses had a mean length of 36.8936.89 inches with a standard deviation of 7.567.56 inches. Assume that the population distribution is approximately normal. Perform a hypothesis test on the accuracy of the machines at the 0.0250.025 level of significance.   Step 2 of 3 :   Compute the value of the test statistic. Round your answer to three decimal places.   step 3of 3 :  Conclusion - Reject the null hypothesis/ fail to reject ...insufficient/sufficient

Q: Recent Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested…

A: Given that Mean(µ) = 24.8 Standard deviations (σ) = 6.2

Q: Bigfoot Field Researchers Organization maintains a database of bigfoot/sasquatch sightings and…

A: From the given information we find the solution.

Q: a. What is the point estimate of the population variance (to nearest whole number)? b. Provide a 90%…

A:

Q: The regression equation for Y is the linear equation Ý = bX + a %3D where Sy b =r М, — b. М. & a =…

A: A least square regression line is called the line of best fit.

Q: The Dodge Reports are used by many companies in the construction field to estimate the time required…

A: We have given thatGiven sample mean (x̄) = 10.3 hoursPopulation mean (μ) = 9 hoursSample standard…

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: The National Center for Health Statistics reports that the systolic blood pressure for males 35 to…

A:

Q: An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots…

A:

Q: An insurance company crashed four cars in succession at 5 miles per hour. The cost of repair for…

A: range:The range is the difference between the maximum and minimum values in a data set. In the…

Q: arry your intermediate computations to three or more decimal places. (If necessary, consult a list…

A: It is given that  Population mean, μ = 725 Sample mean, X̄ = 706 Sample standard deviation, s = 25…

Q: Dougall compared the resting heart rate of average healthy citizens and soldiers suffering from…

A: Given that,Dougall compared the resting heart rate of average healthy citizens and soldiers…

Q: The Dodge Reports are used by many companies in the construction field to estimate the time required…

A: The sample mean is 10.3 and the standard deviation is 4.2.The hypothesized mean is 9.The sample size…

Q: Community college instructors' salaries in one state are very low, so low that educators in that…

A:

Q: An endocrinologist is interested in the effects of depression on the thyroid. It is believed that…

A: Given:

Q: A pool supply company sells 50-pound buckets of chlorine tablets. A customer believes that the…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: A biologist is interested in comparing the size of blue crabs in two river basins: Cooper River and…

A:

Q: Calculate the sample estimate of the standard error of the mean. Show all work.    b. Construct a…

A: Given that Sample size n = 36 Sample mean = 6.8 Sample SD = 1.2 The critical value of t at 98%…

Q: A company of coffee prices at 4 randomly seleced grocery stores in Sampaloc, Manila showed increases…

A: Given data is12,15,17,20sample size(n)=4sample mean(x¯)=12+15+17+204sample mean(x¯)=644sample…

Q: The Dodge Reports are used by many companies in the construction field to estimate the time required…

A: In hypothesis testing, we start by stating the null hypothesis (H0) and the alternative hypothesis…

Q: According to a new study by ABC, the average time spent by young adults ages 20 to 25 in using their…

A: Given information Level of significance=0.10, n=sample size=30, sample mean x̄=7.8, s=sample…

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

A: Here is given that population mean is 650 Sample mean is 642 and standard deviation is 17   and n is…

Q: The population standard deviation for the competitor is known to be 0.70.7 mpg. Test the company’s…

A: We want to find null hypothesis,  alternate hypothesis and test statistics

Q: Determine the decision rule for rejecting the null hypothesis H0H0. Round the numerical portion of…

A: Given that  Sample sizes n1=70      , n2=85       Sample means X̄1=8.84     , X̄2=9.05      ?1 =0.30…

Q: Community college instructors' salaries in one state are very low, so low that educators in that…

A: We have given that the hypothetical mean 51809, sample mean 45068, sample size 33 and standard…

Q: Draw a conclusion and interpret the decision

A: Community college instructors' salaries in one state are very low, so low that educators in that…

Q: The Dodge Reports are used by many companies in the construction field to estimate the time required…

A: Step 1: State the null and alternative hypothesis for this testSince we are testing the manager's…

Q: A medical researcher administers a new medication to a random sample of 70 flu sufferers, and she…

A: From the provided information, The degree of freedom = n1 + n2 – 2 = 70 + 50 – 2 = 118 As, the…

Q: ent company states that the mean monthly rent for apartments on the east side of town is $750. A…

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

Q: A statistician chooses 27 randomly selected dates, and when examining the occupancy records of a…

A: Givensample size(n)=27Variance(s2)=34.34conidence level=95%

Q: The Dodge Reports are used by many companies in the construction field to estimate the time required…

A: Answer,The population mean = 9The sample mean = 8.1The sample standard deviation = 3.8The sample…

Q: If it is known that a town with population 30,000 had 3,170 people who drive a Prius hybrid vehicle.…

A: Solution: The proportion of population who drive a Prius hybrid vehicle is From the given…

Q: An insurance company crashed four cars in succession at 5 miles per hour. The cost of repair for…

A: Given data is ,424 , 455, 406, 211

Q: lights off when no movement is present in a room. Historically, the cost of lighting an average…

A:

Q: The amount of time it takes students to travel to school can vary greatly depending on how far a…

A:

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: local church parish wants to raise money to add to their campus. In a sample from a previous fund…

A: Formula : Test statistic

Q: The Dodge Reports are used by many companies in the construction field to estimate the time required…

A: The objective of this question is to conduct a hypothesis test to determine if the time required to…

Q: A local church parish wants to raise money to add to their campus. In a sample from a previous fund…

A: Given, This is a problem of two sample t-test where we check for differences in the 2 sample…

Q: The adult eastern hellbender (a type of giant salamander) has a length which is normally distributed…

A:

Q: Statewide, the population as a whole watches 6.2 hours of TV per day. A random sample of 1017 senior…

A: Given data is appropriate for testing of hypothesis to test z-test for single mean because it is a…

Q: A laptop producer has been getting complaints on the batteries they install. Particularly, the…

A: There are 9 overheating batteries in the batch of 20 means that the proportion of getting the…

Q: A pool supply company sells 50-pound buckets of chlorine tablets. A customer believes that the…

A: Given information Hypothesized mean µ = 50 pounds Sample size (n) = 30 Mean x̅ = 49.4 pounds…

Q: Many cheeses are produced in the shape of a wheel. Because of the differences in consistency between…

A:

Q: According to the College Board, scores on the math section of the SAT Reasoning college entrance…

A: Given information, Mean =516 Standard deviation =116

Q: The America Automobile Association reported that the mean price of a gallon of regular grade…

A: Hypothesis  Ho: mu=2.82,H1: mu<2.82  n=50, Xbar=2.77, s=0.15 Alpha=0.05=level of significance…

Q: Salvatore, as the director of a regional bank, is concerned about the wait times of customers at the…

A: 48 patrons at each branch selected, For each branch means and standard deviation mentioned. We have…

Q: A bridal gown shop owner owns a store in San Francisco and a store in Redwood city. She is trying to…

A: It is given that the sample size is 25 for each store, for the San Francisco store, the mean amount…