The Human Resources Department is studying absenteeism with employees. They have noticed an unacceptable level of absenteeism that is believed to be related to the general health of the employee Twelve months ago, a fitness program for employees was started at the company. To evaluate the program, a random sample of eight participants were studied before the fitness program began and the same eight participants were studied twelve months later. The Human Resources Department believes the number of absences should change over the twelve months. Employee Before After Difference 1. What is dbar? 2. What is tcrit? 3. What is tstat? 4. What is pvalue? 1 5. What is decision? 6 5 2 6 2 four decimal places four decimal places 3 7 At the 5% significance level, answer the following questions using the following information: Ho: mu d=0 H₂: mud #0 four decimal places 1 4 7 3 5 4 3 6 3 6 7 5 3 8 6 7 standard deviation of sample= 2.92

You are a medical researcher that wants to determine if your new drug can lower people's blood pressure.  You recruit 60 participants with high blood pressure to be part of your study.  You randomly assign participants to one of three groups to receive either 10 mg of your drug, 5 mg, or 0 mg (given as a placebo control).  After 2 weeks, participants' blood pressure is measured and you compare among the 3 groups. Which statistical test would be best to determine if there is a significant difference in blood pressure among the three groups?     one-sample t-test     related samples t-test     independent samples t-test     ANOVA

"Bullying," according to noted expert Dan Olweus, "poisons the educational environment and affects the learning of every child." Bullying and victimization are evident as early as preschool, with the problem peaking in middle school. Suppose you are interested in the emotional well-being of not only the victims but also bystanders, bullies, and those who bully but who are also victims (bully-victims). You decide to measure depression in a group of victims and a group of bully-victims using a 26-item, 3-point depression scale. Assume scores on the depression scale are normally distributed and that the variances of the depression scores are the same among victims and bully-victims. The group of 25 victims scored an average of 25.3 with a sample standard deviation of 9 on the depression scale. The group of 23 bully-victims scored an average of 20.5 with a sample standard deviation of 8 on the same scale. You do not have any presupposed assumptions about whether victims or bully-victims…

A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in New York and Rhode Island. Due to recent trends in the childcare industry, the firm suspects that the that the mean annual income of childcare workers in the state of New York is greater than the mean annual income of childcare workers in Rhode Island. To see if this is true, the firm selected a random sample of 10 childcare workers from New York and an independent random sample of 10 childcare workers from Rhode Island and asked them to report their mean annual income. The data obtained were as follows. Annual income in dollars New York 52865, 45781, 48933, 44123, 52450, 54008, 46219, 44862, 54254, 39329 Rhode Island 52347, 47038, 49732, 47329, 34151, 51204, 39798, 47921, 44854, 39128 Send data to calculator Send data to Excel The population standard deviations for the annual incomes of childcare workers in New York and in Rhode Island are estimated as 6400 and 6600, respectively. It is also…