A car company says that the mean gas mileage for its luxury sedan is at least 21 miles per gallon (mpg). You believe the claim is incorrect andfind that a random sample of 7 cars has a mean gas mileage of 18 mpg and a standard deviation of 5 mpg. At a = 0.05, test the company'sclaim. Assume the population is normally distributed.Click here to view the t-distribution table.Click here to view page 1 of the normal table.Click here to view page 2 of the normal table.Which sampling distribution should be used and why?O A. Use a normal sampling distribution because the populationis normal, and o is known.O C.Use a t-sampling distribution because n < 30.O E. Use a normal sampling distribution because the populationis normal, and is unknown.State the appropriate hypotheses to test.O A. H₂: μ≤21H₂:μ>21O C. H₂: μ#21H₂:μ=21The critical value is. (Round to three decimal places as needed.)What is the outcome and the conclusion of this test?O B. Use a t-sampling distribution because the populationis normal, and σ is unknown.Ho. At the 5% significance level, there ismileage for the luxury sedan is at least 21 miles per gallon.O D.O F.Use a normal sampling distribution because n> 30.Use a t-sampling distribution because the populationis normal, and σ is known.O B. Ho: p=21H₂:μ*21What is the value of the standardized test statistic?The standardized test statistic is (Round to two decimal places as needed.)What is the critical value?D. Ho: μz 21H₂:μ<21evidence tothe car company's claim that the mean gas

Sample size n =7 Sample mean=18 Standard deviation =5 NOTE:- According to bartleby guidelines expert…

Answered: company says that the mean gas mileage…

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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The average number of cavities that thirty-year-old Americans have had in their lifetimes is 8. Do twenty-year-olds have a different number of cavities? The data show the results of a survey of 15 twenty-year-olds who were asked how many cavities they have had. Assume that the distribution of the population is normal. 7, 10, 9, 7, 10, 6, 6, 9, 11, 6, 9, 12, 10, 10, 11 What can be concluded at the αα = 0.01 level of significance? For this study, we should use t test for a population mean The null and alternative hypotheses would be: H0: Mean = __?__ H1: Mean < __?__ The test statistic t= __?__ (please show your answer to 3 decimal places.) The p-value = __?__ (Please show your answer to 4 decimal places.) The p-value is >α Based on this, we should fail to reject the null hypothesis. Thus, the final conclusion is that ... Please choose one below The data suggest that the population mean number of cavities for twenty-year-olds is not significantly different…
Use the standard normal distribution to compare two other normal distributions. 25. Blood pressure is described by two numbers: systolic pressure and diastolic pressure (measured in mmHg, or millimeters of mercury). For example, a blood pressure of 120/80 denotes a systolic pressure of 120 mmHg and a diastolic pressure of 80 mmHg. A study of 625 persons ages 26 to 45 finds that their blood pressures are normally distributed. Their systolic pressure had a mean of 122 and a standard deviation of 14, and their diastolic pressure had a mean of 83 and a standard deviation of 9. Two study participants are randomly selected and their blood pressures are measured again. The first participant had a systolic reading of 99 mmHg, while the second had a diastolic reading of 70 mmHg. Which participant had the lower reading with regard to the study population? 26. Health experts often consider blood pressure to be elevated if systolic pressure is 140 or greater or the diastolic pressure is 90 or…
Which statement about the normal distribution is false? Approximately 68 % of the data lie within 1 standard deviation of the mean. Approximately 99.7% of the data lie within 3 standard deviation of the mean. None of these is true. Approximately 95% of the data lie within 2 standard deviation of the mean. SAMSUNG C Oll % & ★
Just write the correct answer. No need to explain
please solve: B, C, and D ch 10
The average retirement age in America is 62 years old. Gerardo thinks that yoga teachers owners retire at age that is younger than average. The data below shows the results of a survey of yoga teachers about the age where they retired. Assume that the distribution of the population is normal. 49, 65, 66, 65, 51, 65, 51, 47, 57, 60, 66 Download CSV or cut and paste into Desmos E. We want to test Gerardo's claim at the 0.09 level of significance. i) For this study, which type of test should we use? t-test for a population mean ii) The null and alternative hypotheses would be: Но: 62 На: 62 ii) The test statistic is 1.59 (Please round your answer to 2 decimal places.) iii) The p-value = 0.072 (Please round your answer to 3 decimal places.) iv) What is our conclusion regarding the null hypothesis? Explain. The data suggest the population mean number of retire teachers that own a yoga store is not significantly less than 62 years old at 0.09 level, so there is insufficient evidence to…
P K @ 2 Listed in the data table are IQ scores for a random sample of subjects with medium lead levels in their blood. Also listed are statistics from a study done of IQ scores for a random sample of subjects with high lead levels. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Click the icon to view the data table of IQ scores. Help me solve this S a. Use a 0.01 significance level to test the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels. What are the null and alternative hypotheses? Assume that population 1 consists of subjects with medium lead levels and population 2 consists of subjects with high lead levels. F2 W 30² OA H₂: #₁ = 1/₂ H₁: Hy #4₂ OC. Ho: Hy #4₂ H₁: Hy > H₂ The test statistic is (Round to two decimal places as needed.) mmand X…
Use the Central Limit Theorem to find the mean and standard error of the mean of the sampling distribution. Then sketch a graph of the sampling distribution. The mean price of photo printers on a website is $227 with a standard deviation of $58. Random samples of size 22 are drawn from this population and the mean of each sample is determined. Question content area bottom Part 1 The mean of the distribution of sample means is enter your response here . Part 2 The standard deviation of the distribution of sample means is enter your response here . (Type an integer or decimal rounded to three decimal places as needed.) Part 3 Sketch a graph of the sampling distribution. Choose the correct answer below. A. 224 227 230Mean price (in $) x A bell shaped curve is over a horizontal x overbar axis labeled Mean price (in dollars) from 224 to 230 in increments of 1 and is centered on 227. B. -3 0 3Mean…
Assume the samples are random and independent, the populations are nomally distributed, and the population variances are equal. The table available below shows the prices (in dollars) for a sample of automobile batteries. The prices are classified according to battery type. At a = 0.10, is there enough evidence conclude that at least one mean battery price is different from the others? Complete parts (a) through (e) below. E Click the icon to view the battery cost data. (a) Let u1. P2. H3 represent the mean prices for the group size 35, 65, and 24/24F respectively. Identify the claim and state Ho and H. H Cost of batteries by type The claim is the V hypothesis. Group size 35 Group size 65 Group size 24/24F 101 111 121 124 D 146 173 182 278 124 140 141 89 (b) Find the critical value, Fo, and identify the rejection region. 90 79 84 The rejection region is F Fo, where Fo = (Round to two decimal places as needed.) (c) Find the test statistic F. Print Done F= (Round to two decimal places as…
List and describe at least three characteristics of the normal distribution.Find an example of something that you would expect to be normally distributed and share it. Explain why you think it it normally distributed.Find an example of something that you would not expect to be normally distributed and share it. Explain why you think it would not be normally distributed.Find a web-based resource that is helpful in understanding the Normal Distribution.
please see image
The average number of cavities that thirty-year-old Americans have had in their lifetimes is 8. Do twenty-year-olds have a different number of cavities? The data show the results of a survey of 13 twenty-year-olds who were asked how many cavities they have had. Assume that the distribution of the population is normal. 11, 7, 6, 12, 8, 9, 10, 11, 10, 6, 8, 10, 10 What can be concluded at the αα = 0.10 level of significance? The null and alternative hypotheses would be: Please provide number H0:H0: mean = __?__ H1:H1: mean not equal to __?__ The test statistic t = __?__(please show your answer to 3 decimal places.) The p-value = __?__ (Please show your answer to 4 decimal places.)

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