Math

StatisticsQ&A Library10.9 A car magazine is comparing the total repair costs incurredduring the first three years on two sports cars, the T-999 and the XPY.Random samples of 45 T-999s and 51 XPYS are taken. All 96 cars are3 years old and have similar mileages. The mean of repair costs forthe 45 T-999 cars is $3300 for the first 3 years. For the 51 XPY carsthis mean is $3850. Assume that the standard deviations for the twopopulations are $800 and $1000, respectivelya. Construct a 99% confidence interval for the differencebetween the two population meansb. Using a 1% significance level, can you conclude that suchmean repair costs are different for these two types of cars?c. What would your decision be in part b if the probability ofmaking a Type I error were zero? ExplainQuestion

Asked Nov 7, 2019

41 views

Step 1

The provided information for the T-999 and XPY sports cars are:

Step 2

(a)

The formula to calculate the confidence interval for differences in population mean is:

Step 3

The required value of z can be ...

Tagged in

Find answers to questions asked by student like you

Show more Q&A

Q: A card is selected at random in a standard deck of 52 cards. What is the probability of selecting a ...

A: The number of cards in a deck is 52. In these 52 cards number of red cards is 26 and number of black...

Q: I'm studying for an exam tomorrow, and I keep getting stuck on the same section of problems, no matt...

A: The test is randomized, so, the answers will vary, one of the possible answers is given below:In thi...

Q: Suppose that 30% of all students who have to buy a text for a particular course want a new copy (the...

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are sol...

Q: In the United States, the mean age of men when they marry for the first time follows the normal dist...

A: It is given that the mean and standard deviation are 29 years and 2.5 years, respectively. The sampl...

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 263 days...

A: Let us define the random variable X as the lengths of pregnancies in a small rural village are norma...

Q: To estimate the mean score ? of those who took the Medical College Admission Test on your campus, yo...

A: Part-aGivenStandard deviation = 6.5According to 68-95-99.7 rule with in one standard deviation of me...

Q: The town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if...

A: Introduction:The sampling distribution of the sample mean, X̅ for a large sample (n ≥ 30) is approxi...

Q: Use the standard normal distribution (aka z distribution where mu = 0 and sigma = 1) to determine th...

A: Consider, -a and +a beConsider, -a and +a be two middle values that cover 85% of the area.Thus,two m...

Q: Please show TI 84 steps

A: The provided random sample are given as: