f test, 1propZtest, ttest, 2propZtest, Ztest , ANOVA, chi squared
test, ttest on the differences, 2sampttest, linregttest| CALCULATOR FUNCTION | HYPOTHESIS TEST NAME |
| mean(population sd known) | Z test |
| mean(population sd unknown) | t test |
| matched pairs | t test on the differences |
| correlation | ANOVA F test(we can perform t test also) |
| 2 proportions | 2 prop Z test |
| test for independence | chi squared test |
| 2 means(independent sample) | 2 sample t test |
| proportion | 1 prop Z test |
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f test, 1propZtest, ttest, 2propZtest, Ztest , ANOVA, chi squared test, ttest on the differences, 2sampttest, linr...
1. Twelve pairs of identical twins that were separated at birth are reunited at age 21. Each twin is weighed. Of interest is if identical twins raised separately will weigh within 10 pounds of each other as young adults. The sample average difference was 12.1 pounds with a standard deviation of 3.4 pounds. If we conduct a hypothesis test, the distribution to use is ______________. a. Normal b. Binomial c. Student-t with df = 24 d. Student-t with df =...
To study metabolism of insects, researchers fed 20 cockroaches a measured amount of a sugar solution. After 10 hours, they dissected the cockroaches and measured the amount of sugar in various tissues. The researchers wish to use the resulting data to estimate the mean amount of sugar in all cockroaches after 10 hours. Hypothesis test for one population mean (unknown population standard deviation) Confidence interval estimate for one population mean (unknown population standard deviation) Hypothesis test for population mean from paired...
How do you know if a hypothesis test is testing the claim between 2 population proportions or 2 means? How is the test statistic for a claim about 2 population means, independent samples, standard deviations unknown, similar to the test statistic for 1 population mean, standard deviation unknown? If the difference between the 2 population means is not significant, which means the test statistic falls within the "usual" area of the distribution, what is the decision about the null hypothesis?...
Forty refrigerators from two different models of a refrigerator manufacturer are compared to see if the smaller model uses less energy than the larger model. The energy was measured in kilowatt hours per month (kwh/mo). From years of testing these models, it is known that the standard deviation of kwh/mo is 34 kwh/mo for the smaller model and 40 kwh/mo for the larger one. From this survey, the sample means and standard deviations are 125 and 34, and 90 and...
One hundred men and one hundred women are surveyed to determine if the percent of women that lie about their age is the same as the percent of men, or if the percent of women is higher than the percent of men. The hypothesis test to use is two proportions independent group means, population standard deviations known independent group means, population standard deviations unknown matched or paired samples Question 10 1 pts of interest is whether the percent of managers...
QUESTION 2 When shouldI use the Welch's t-test? Remember that some tests, such as chi squared, can be used under various circumstances. The goal of the test changes based on the situation. Pay attention to the specific conditions noted in parenthesis to ensure you are picking the correct goal Compare categorical frequency data with an expected population proportion. No difference between observed and expected proportions is used as the null hypothesis B. More than two treatment groups where a normal...
Please help. One hundred people participate in a multiplication study. They are timed to see how many single digit multiplication problems they can answer in their head without a mistake. Then, they each repeat the task with their eyes closed. For each individual, the difference in times is calculated. The purpose of the study is to determine if having your eyes opens slows down the time it takes to multiply. The hypothesis test to use is a. independent group means,...
9. One hundred men and one hundred women are surveyed to determine if the percent of women that lie about their weight is the same as the percent of men, or if the percent of women is higher than the percent of men. The hypothesis test to use is ______________. a. independent group means, population standard deviations known b. two proportions c. independent group means, population standard deviations unknown d. matched or paired samples 10. Fourteen cars from two different...
Sony would like to test the hypothesis that the average age of a PlayStation user is different from the average age of an Xbox user. A random sample of 36 PlayStation users had an average age of 34.2 years while a random sample of 30 Xbox users had an average age of 32.7 years. Assume that the population standard deviation for the age of PlayStation and Xbox users is 3.9 and 4.0 years, respectively. Sony would like to set α...
Sony would like to test the hypothesis that the average age of a PlayStation user is different from the average age of an Xbox user. A random sample of 36 PlayStation users had an average age of 34.2 years while a random sample of 30 Xbox users had an average age of 32.7 years. Assume that the population standard deviation for the age of PlayStation and Xbox users is 3.9 and 4.0 years, respectively. Sony would like to set α...