A used car dealer says that the mean price of a three-year-old sports utility vehicle is $23,000. You suspect this claim is incorrect and find that a random sample of 21 similar vehidles has a mean price of $23,626 and a standard deviation of$1978. Is there enough evidence to reject the claim at a = 0.01? Complete parts (a) through (e) below. Assume the population is normally distributed.(a) Write the claim mathematically and identify Ho and HWhich of the following correctly states Ho and H,?O A. Ho: u#$23,000H:= $23,000O B. Ho: = $23,000C. Hạ: u= $23,000Hu<$23,000H: u+$23,000O D. Ho: u2 $23,000O E. Ho: u> $23,000H us $23,000OF. Ho: u= $23,000Hu> $23,000Hu< $23,000(b) Find the critical value(s) and identify the rejection region(s).What is(are) the critical value(s), to?(Use a comma to separate answers as needed. Round to three decimal places as needed.)

Given: Hypothesis population mean = µ = 23000 Sample Mean (x ) = 23626 Sample…

Answered: Aused car dealer says that the mean…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A used car dealer says that the mean price of a three-year-old sports utility vehicle is $23,000. You suspect this claim is incorrect and find that a random sample of 21 similar vehícles has a mean price of $23,626 and a standard deviation of $1978. Is there enough evidence to reject the claim at a = 0.012 Complete parts (a) through (e) below. Assume the population is normally distributed. (a) Write the claim mathematically and identify Ho and H. Which of the following correctly states Ho and H,? O A. Ho: u#$23,000 H:p= $23,000 O B. Ho: u= $23,000 c. Hạ: u= $23,000 Hu $23,000 H us $23,000 OF Ha: u $23,000 Hu> $23,000 (b) Find the critical value(s) and identify the rejection region(s). What is(are) the critical value(s), to? to = -2.845,2.845 (Use a comma to separate answers as needed. Round to three decimal places as needed.) Determine the rejection region(s). Select the correct choice below and fill in the answer box(es) within your choice. (Round to three decimal places as needed.)…
The distribution of lowa Test of Basic Skills vocabulary scores for seventh-grade students in Gary, Indiana, is close to normal. Suppose that the distribution is exactly Normal with a mean of 6.84 and standard deviation of 1.55. What percent of the ITBS vocabulary scores are less than 3.74? 3 type your answer..... What percent of the scores are between 5.29 and 9.94? type your answer... 2 points d % C % f 5 t Templ b h u n m k alt P ctri
10) A county is considering raising the speed limit on a road because they claim that the mean speed of vehicles is greater than 40 mi/hr. A random sample of 15 vehicles has a mean speed of 43 mil/hr and a standard deviation of 4.4 mi/hr. Assume that speeds follow a normal distribution. What statistical test should be used to test the claim? (pick one of the options) 1. t-test 2. 2.73 3. 15 4. 10.9 5. 14 6. z-test 7. 2.52 8. 2.64 Calculate the value of standardized test statistic. (pick one of the options) 1. t-test 2. 2.73 3. 15 4. 10.9 5. 14 6. z-test 7. 2.52 8. 2.64 What is the degree of the freedom for the distribution of the test statistics. (pick one of the options) 1. t-test 2. 2.73 3. 15 4. 10.9 5. 14 6. z-test 7. 2.52 8. 2.64
1. Among American women aged 20 to 29 years, 10% are less than 60.8 inches tall, 80% are between 60.8 and 67.6 inches tall, and 10% are more than 67.6 inches tall. Assuming that the height distribution can adequately be approximated by a normal curve, find the mean and standard deviation of the distribution.
(AKS 24): A technology magazine finds data that suggests the prices of computers with a specific configuration follow an approximately normal distribution with a mean of $895.22 and a standard deviation of $109.30. The magazine wants to describe the percentage of these computers that are priced below $600. WWhat Z-Score should they use? O a) z = 1.3 %3D O b) z = -1.3 c) z = -2.7 %3D d) z = 2.7 Question 2 (1 point) (AKS 24): A set of laptop prices are normally distributed with a mean of $750 and a
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2. The average gasoline price of one of the major oil companies has been $1.00 per gallon. Because of shortages in production of crude oil, it is believed that there has been a significant increase in the average price. In order to test this belief, we randomly selected a sample of 36 of the company's gas stations and determined that the average price for the stations in the sample was $1.04. Assume that the standard deviation of the population (o) is $0.12. a) State the null and the alternative hypotheses for testing the belief. b) Describe a Type I error and a Type II error for this situation. c) What is the critical value at a = .05? d) what's your What is the t-statistic or z-statistic associated with the above sample results?
Assume all populations are normally distributed. A travel analyst claims that the mean price of a round trip flight from New York City to Los Angeles is less than $507. In a random sample of 55 round trip flights from NYC to LA, the mean price is $502. Assume the population standard deviation is $111. At α = 0.05, is there enough evidence to support the travel analyst’s claim?
The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million and a standard deviation of $2 million. The salaries of professional football players are also heavily skewed right with a mean of $1.9 million and a standard deviation of $1.5 million. A random sample of 40 baseball players' salaries and 35 football players' salaries is selected. The mean salary is determined for both samples. Let -T, represent the difference in the mean salaries for baseball and football players. Which of the following represents the standard deviation of the sampling distribution for - -- ? O 0.41 million O 0,57 million Save and Exit Next Submit Mark this and return hp & 4 6. 7 8. 9. y h k

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