The mean measured verbal IQ (IQV) score of a random sample of 20 children was 86.9 with a standard deviation of 18.5. The mean measured performance IQ score (IQP) of a random sample of 20 children was 101.8 with a standard deviation of 20.0. Using the Critical Value method and alpha = 0.005 to test the claim that the mean IQV is less than the mean IQP. Assume the population variances are not equal (so use unpooled). %3D HO: mu1<=mu2 claim Ha: mu1>mu2 HO: mu1>mu2 claim Ha: mu1<=mu2 HO: mu1>=mu2 claim la: mu1=mu2 Ha: mu1mu2 claim O HO: mu1>mu2 Ha: mu1<=mu2 claim

The mean measured verbal IQ (IQV) score of a random sample of 20 children was 86.9 with a standard deviation of 18.5. The mean measured performance IQ score (IQP) of a random sample of 20 children was 101.8 with a standard deviation of 20.0. Using the Critical Value method and alpha = 0.005 to test the claim that the mean IQV is less than the mean IQP. Assume the population variances are not equal (so use unpooled). %3D HO: mu1<=mu2 claim Ha: mu1>mu2 HO: mu1>mu2 claim Ha: mu1<=mu2 HO: mu1>=mu2 claim la: mu1=mu2 Ha: mu1mu2 claim O HO: mu1>mu2 Ha: mu1<=mu2 claim

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

The average farm size in the United States is 444 acres. A random sample of 40 farms in Oregon indicated a mean size of 430 acres, and the population standard deviation is 52 acres. At alpha = 0.05, can it be concluded that the average farm in Oregon differs from the national mean? Use the P-value method.
A person read that the average number of hours and adult sleeps on Friday night to Saturday morning was 7.3 hours. The researcher feels that college students do not sleep 7.3 hours on average. The researcher randomly selected 17 students and found that on average they slept 8.5 hours. The standard deviation of the sample is 1.4 hours. At (alpha) = 0.01, is there enough evidence to say that college students do not sleep 7.3 hours on average? Assume that the population is approximately normally distributed. Use the critical value method and tables. A. State the hypotheses and identify the claim with the correct hypothesis. B. Find the critical value(s). C. Compute the test value. D. Make the decision. E. Summarize the results.
a consumer group clamins that the mean minimum time it takes for a sedan to travela quarter mile is greater than 14.7 seconds. A random sample of 22 sedans has a mean minimum time to travel a quarter mile of 15.4 seconds and a standard deviation of 2.10 seconds. At alpha= 0.10, do you have enough evidence to support the consumer group's claim?
An auto manufacturer claims that the variance of the gas mileage in a model of a hybrid vehicle is 0.16. A random sample of 30 vehicles has a variance of 0.26. At alpha = 0.05, is there enough evidence to reject the claim? Assume the population is normally distributed.
A random sample of 81 tourists in Chattanooga showed that they spent an average of $2000(in a week) with a standard deviation of $100 and a sample of 64 tourists in Ontario showed that they spent an average of $2500(in a week) with a standard deviation of $144. We are interested in determining if there is any significant difference between the average expenditures of those who visited the two cities? Test the hypothesis at alpha=0.05 and write all the steps.
A random sample of 32 items from the first population showed a mean of 112 and a standard deviation of 19. A sample of 28 items for the second population showed a mean of 106 and a standard deviation of 8. Test the assumption that the population variances are equal with 0.10 significance level. Then, using a 0.05 significance level, test the hypothesis that the population means are equal.
A random variable of 25 packs of powdered milk showed a mean content of 237 grams with a standard deviation of 8.56 grams while a sample of 20 packs of another brand of powdered milk showed a mean content of 240 grams with a standard deviation of 9.75 grams. Using a 0.05 level of significance, is there significant difference in the mean content of the two brands of powdered milk? Assumed variances are equal.
Steel bars with a mean ultimate tensile strength of 400 Megapascal (MPa) with a variance of 81 MPa were delivered by the manufactured. The project engineer tested 50 steel bars and found out that the mean ultimate tensile strength is 390 MPa. The decision for the extension of the contract with the manufacturer depends on the engineer. Test the hypothesis whether there is no significant difference between the two means using a two-tailed with a=0.01
A random sample of 10 size AA batteries for toys yield a mean of 2.87 hours with standard deviation, 0.69 hours. Find the critical value, t*, for a 99% CI and the margin of error for a 99% CI. Give both to 3 decimal places.
The average local cell phone call length was reported to be 2.27 minutes. A random sample of 10phone calls showed an average of 2.98 minutes in length with a standard deviation of 0.98 minute. At alpha= 0.01can it be concluded that the average differs from the population average?
A manufacturer of air conditioners seeks to ensure that their air conditioners are efficient enough that they will use no more than 2800 watt/hr under typical usage.The quality control department has tested a sample of 63 air conditioner units and found an average energy use of 7000 watts/hr. From previous tests, it can safely be assumed that the population standard deviation is 10000 watts/hr. Use the p-value approach and a 0.01 level of significance to test to see if the air conditioners are using too much energy. What is the P value?
A quality control expert at a local dairy claims that its cartoons contain more than 64oz of milk a sample of 15 cartoons reveals a mean of 65 and 1.1 oxs respectively. At the 1% level, does the appropriate hypothesis support his claim? find and interpret the p value