Here we are testing whether this years's mean rented mileage is less than last year's. The null hypothesis will therefore be opposite of this claim.
The last years mean = 2800
(Mean mileage is greater or equal to 2800)
(Mean mileage is less than 2800)
Type 1 error is to reject the null hypothesis when it is true.
Reject the null hypothesis : Means that the mean mileage < 2800
When null is true : Mean in fact is 2800
A type 1 error is to reject the null hypothesis that is less than 2800 when in fact is greater than or equal to 2800.
If the group is deciding to reject the nul hypothesis then it can make
type 1 error.
A consumer advocacy group is doing a large study on car rental practices. Among other things,...
A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to do a statistical test regarding the mean monthly mileage, u, of cars rented in the U.S. this year. The consumer group has reason to believe that the mean monthly mileage of cars rented in the U.S. this year is less than last year's mean, which was 2800 miles. The group plans to do a statistical test regarding the...
A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to do a statistical test regarding the mean monthly mileage, H, of cars rented in the US, this year. The consumer group has reason to believe that the mean monthly mileage of cars rented in the U.S. this year is less than last year's mean, which was 2750 miles. The group chooses a random sample of 75 cars rented...
Problem Page A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to do a statistical test regarding the mean monthly mileage, μ, of cars rented in the U.S. this year. The consumer group has reason to believe that the mean monthly mileage of cars rented in the U.S. this year is greater than last year's mean, which was 2850 miles.The group plans to do a statistical test regarding...
A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to estimate the mean monthly mileage, u, of cars rented in the U.S. over the past year. The consumer group plans to choose a random sample of monthly U.S. rental car mileages and then estimate u using the mean of the sample. Using the value 850 miles per month as the standard deviation of monthly U.S. rental car mileages...
A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to estimate the mean monthly mileage, pl, of cars rented in the U.S. over the past year. The consumer group plans to choose a random sample of monthly U.S. rental car mileages and then estimate u using the mean of the sample. Using the value 850 miles per month as the standard deviation of monthly U.S. rental car mileages...
A random sample of 350 bolts from machine A contained 31 defective bolts, while an independently chosen, random sample of 375 balts from machine B contained 30 defective bolts. Let P, be the proportion of the population of all bolts from machine A that are defective, and let py be the proportion of the population of all bolts from machine B that are defective. Find a 95% confidence interval for P-P2. Then complete the table below. Carry your intermediate computations...
2. The manufacturer of a new model car (Camry) claims that a typical car get 26 miles per gallon. A consumer advocacy group is skeptical of this claim and thinks that the mean gas mileage, , of all Camrys may be less than 26 mpg. The group plans to perform the hypothesis test at a = 0.05, using a sample of 30 Camrys. Ho: u = 26 mpg Hu<26 mpg Find the probability of making a Type II error if...
4. [15] Suppose that you are an analyst for the non-profit auto safety and consumer advocacy organization known as Consumer for Auto Reliahility and Safety (CARS). You are investi- gating the average highway gas mileage for the new Toyota Prius. In this quest, you reuted and drove 20 new Toyota Prii (plural of Prius). e ta Tou began your investigation by finding a confidence interval. Assuming that all se remains unchanged, which of the following will yield a narrower confidence...
A consumer advocacy group claims that the mean mileage for the Company A's newsedan is less than 23 miles per gallon. What is the type I error for the test? Select one: a. Fail to reject the claim that the mean equals 23 miles per gallon when it is actually less than 23 miles per gallon. O b. Fail to reject the claim that the mean equals23 miles per gallon when it is actually greater than 23 miles per gallon....
A union of restaurant and foodservice workers would like to estimate this year's mean hourly wage, u, of foodservice workers in the U.S. Last year's mean hourly wage was $8.08, and there is reason to believe that this year's value is greater than last year's. The union decides to do a statistical test to see if the value has indeed increased. The union chooses a random sample of this year's wages, computes the mean of the sample to be $8.45,...