A track coach is trying to decide whether to recommend a new running shoe by Converse or his preferred shoe by Nike. The coach decides to recruit four of his runners to run one kilometer with each shoe type. The coach spreads his experiment over two days, to allow his runners to rest. Below are the run times in minutes. Are the run times for the two types of shoes diff

One sample has n=7 and SS=35 and a second sample has n =17 and SS =45. What is the pooled variance for these two samples?

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Scenario: 200 people were asked, “Who is your favorite superhero?” Below are the data.  Test the null hypothesis that the population frequencies for each category are equal.  α= .05. Iron Man Black Panther Wonder Woman Spiderman fo = 40 fo = 60 fo =55 fo = 45 fe = fe = fe = fe =   What is the correct result based on the data?

Identify the type I error and the type II error that correspond to the given hypothesis.   The percentage of households with Internet access is greater than 60%.

age As a labor economist, you would like to measure the effect that an older sibling has on the average level of education for the youngest sibling. You randomly select 137 individuals from t Longitudinal Study of Youth (NLSY) that have an older brother (population 1) and 245 individuals that have an older sister (population 2) and compare the average level of education of the sibling depending on having an older brother or older sister. Which of the following is the best test to use for your hypothesis assuming only the following tests are available? Use "Formula Sheet Fall 2020" if necessary. Select one: O a. A paired sample t-test for the difference in two population means O O O b. Az-test for the difference in two population means c. A t-test for the difference in two population means with unknown but equal variances d. A chi square test for single population variance e. An F-test for the ratio of two population variances Finish

Consider the experiment of tossing a coin twice...please check my work   List the experimental outcomes. Let H=Heads & T=Tails Define a random variable that represents the number of heads occurring on the two tosses. Show what value the random variable would assume for each of the experimental outcomes.

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A matched-subjects study and an independent-measures study both produced a t statistic with df = 10. How many individuals participated in each study? Can you explain this answer?  I have asked twice and have gotten two wrong answers kindly help. Thank you!

You are testing the difference between high school freshmen and seniors on SAT performance. The null hypothesis is that the population mean SAT score of the seniors is equal to the population mean SAT score of the freshmen. You randomly sample 20 students in each grade and have them take the SAT. You find that the sample mean of the seniors is significantly higher than the sample mean of the freshmen. Which alternative hypothesis is accepted? The population mean SAT score of the seniors is less than the population mean SAT score of the freshmen. The population mean SAT score of the seniors is greater than the population mean SAT score of the freshmen. You cannot be sure which alternative hypothesis to accept. You just know that the null hypothesis was rejected