A children’s clothing company sells hand-smocked dresses. The length of one particular size of dress is designed to be 39 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 18 dresses had a mean length of 34.24 inches with a standard deviation of 10.19 inches. Assume that the population distribution is approximately normal. Perform a hypothesis test on the accuracy of the machines at the 0.01 level of significance. Step 2 of 3:  Compute the value of the test statistic. Round your answer to three decimal places Step 3 of 3:  Draw a conclusion and interpret the decision

Q: widgels. process is working properly, it turns out that tne widgets are normally distri with a mean…

A: Given : n=25 , X-bar=2.46  , s=0.16 , μ0=2.6 , α=0.05 Since , the population standard deviation (σ)…

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: Companies who design furniture for elementary school classrooms produce a variety of sizes for kids…

A: Given that, Mean = 39.2 Standard deviation = 1.9 Let X follows Normal distribution with mean 39.2…

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

A: The question is about hypo. testing Given : Popl. mean amount of wireless data used by teenagers ( μ…

Q: The Gidget Company makes widgets. If the production process is working properly, it turns out that…

A: To find:  The critical value for the test. It is given that sample standard deviation is given so we…

Q: a certain country the heights of adult men are normally distributed with a mean of 66.4 inches and a…

A: According to the given information in this questionWe need to find the what percentage of this​…

Q: Dr. Samwell Tarly wants to estimate the number of books checked out of the library in the past year.…

A: It is given that the mean is 10,000 and the standard deviation is 10.

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

A: The objective of this question is to test Ella's claim that the average amount of wireless data used…

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

A:

Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

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

A: The hypotheses are given below: Null hypothesis: H0: µ1 = µ2 Alternative hypothesis: HA: µ1 ≠ µ2…

Q: A successful basketball player has a height of 6 feet 8 ​inches, or 203 cm. Based on statistics from…

A: Consider X is a random variable defined as the height of a successful basketball player.The provided…

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: Solution

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

A: The objective of the question is to state the null and alternative hypotheses for the test. The null…

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

A: The objective of this question is to test Ella's claim that the average amount of wireless data used…

Q: The mean gas mileage for a hybrid car is 57 miles per gallon. Suppose that the gasoline mileage is…

A:

Q: A company finds that for its 12 ounce cans of soda, the actual amount of soda inside is Normally…

A: Solution-: Given: μ=12,σ=0.25 We find x value such that P[X<x]=0.15

Q: The WNBA was founded in 1996 as the women's counterpart to the NBA. The heights of the women playing…

A: Given data: The heights of the women have a symmetrical distribution with mean and standard…

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

A: given data, population distribution is approximetly normal.α=0.005n=16claim:μ<5x¯=4.6s=1.5test…

Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of…

A: Let X be the length of the steel rods. Then X~N (144.3,0.8) i.e. µ=144.3 and σ=0.8

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

A: State the null and alternative hypotheses for the test. Fill in the blank below. H0: μ=6:…

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

A: The objective of this question is to compute the value of the test statistic for Ella's claim that…

Q: Airline companies are interested in the consistency of the number of babies on each flight, so that…

A: Test for Variance: The χ2 Chi-Square test is used to test the significance difference between…

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: The mean annual tuition and fees for a sample of 15 private colleges was $41,200 with a standard…

A: Given: n=15x¯=41200s=5300μ=38000α=0.05 The test hypothesis are, H0: μ=38000H1: μ≠38000. This is a…

Q: A candy store sells about 8 million pieces of candy per day with a standard deviation of 300,000…

A: Given : Let X : Number candy that they sell in a given day           μ = 8 million i.e   Mean (μ) =…

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

A: Given Hypothesized mean = 7 Gb sample mean , x = 6.2 Gb sample standard deviation , s = 1.7 Gb level…

Q: Assume the annual day care cost per child is normally distributed with a mean of ​$9000 and a…

A:

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: Given data,n1=40x1=46.6σ1=4.6n2=45x2=48.8σ2=2.4Compute value of test statistic?

Q: parenting magazine reports that the average amount of wireless data used by teenagers each month is…

A: To test Ella's claim, we can perform a one-sample t-test. Here are the steps involved:   Step 1:…

Q: The salary for workers at a company are normally distributed with a mean of $60,000 and a standard…

A:

Q: A particular fruit's weights are normally distributed, with a mean of 464 grams and a standard…

A: Let "x" be the weight of the fruit in grams. Sketch the normal curve and shade the area of 0.18…

Q: During the fall season of racing at Dover International Speedway, the mean speed of the cars racing…

A: Assume that the racing speeds are normally distributed.

Q: A parent claims that children spend about 2 hours a day in front of computer screens. We think that…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

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

Q: A certain prescription medicine is supposed to contain an average of 250 parts per million (ppm) of…

A: It is given that, sample size,n=100 Test statistic =-3 Now,The required p-value can be calculated…

Q: In a certain country the heights of adult men are normally distributed with a mean of 68.8 inches…

A: Suppose the random variable x defines the height of adult men.

Q: A certain prescription medicine is supposed to contain an average of 250 parts per million (ppm) of…

A:

Q: A company has rolled out a new process for sales people to use. They were able to go back into the…

A: Given, We are given that, Population mean = μ = $108 Population Standard devation = σ = $12 Sample…

Q: A manufacturer is producing metal rods, whose lengths are normally distributed with a mean of 65.0…

A: #.Given : length of rod follow normal distribution with mean=65 cm and standard deviations=0.3 cm…

Q: In the United States, egg sizes are set by the Department of Agriculture. A "large" egg, for…

A:

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

A:

Q: The average McDonald's restaurant generates $3.6 million in sales each year with a standard…

A: In this question given that survey of 27 restaurant Find out a null and alternative hypothesis…

Q: A luxury furniture manufacture will make custom furniture for their customers. Pricing is based on…

A: given data, normal distributionμ=280σ=40we have to find out the given probabilities