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In 2010 and 2012, Gallup asked the same 50 people how many hours had they worked at a job in the past 7 days. Is there a difference in the population mean amount of hours worked at a job between 2010 and 2012? Would this be an example of independent or dependent samples?

An education specialist was studying SAT verbal scores at a local university. She found the following 95% confidence interval for the population mean score for SAT verbal: (450, 550). She also conducted a significance test at Ho: mu = 475 versus Ha: mu does not equal 475. The p-value for this test was 0.14.  Which of the following statements accurately describes this situation?

An education specialist was studying SAT verbal scores at a local university. She found the following 95% confidence interval for the population mean score for SAT verbal: (450, 550).   She also conducted a significance test at Ho: mu = 445 versus Ha: mu does not equal 445. The p-value for this test was 0.0007. Which of the following statements accurately describes this situation?

A nutritionist was interested in studying American’s opinions about healthy living. One hundred randomly selected people who were starting a diet were asked if they consumed at least 24 ounces of water a day. After six months, the same 100 people were asked if they consumed at least 24 ounces of water a day   Six months later “Yes, consumed at least 24 ounces of water” Six months later “No, did not” Initial Response “Yes, consumed at least 24 ounces of water” 60 20 Initial Response “No did not” 5 15  Besides random sampling, what other assumption needs to be met? Is it met?

A nutritionist was interested in studying American’s opinions about healthy eating. One hundred randomly selected people who were starting a diet whre asked if they ate three servings of whole grains a day. After six months, the same 100 people were asked if they ate three servings of whole grains a day. Besides random sampling and categorical data, what other assumption needs to be met? Is it met?   Six months later “Yes, ate whole grains” Six months later “No, did not” Initial Response “Yes, ate whole grains” 36 15 Initial Response “No did not” 7 42

Suppose that you have the following hypothesis: Ho:

In 2012, the General Social Survey included a question that asked participants how many hours they worked a week on household chores. Do females spend more hours working on household chores than males?   Would this be an example of independent or dependent samples?

A nutritionist was interested in studying American’s opinions about healthy living. One hundred randomly selected people who were starting a diet were asked if they consumed at least 24 ounces of water a day. After six months, the same 100 people were asked if they consumed at least 24 ounces of water a day   Six months later “Yes, consumed at least 24 ounces of water” Six months later “No, did not” Initial Response “Yes, consumed at least 24 ounces of water” 50 25 Initial Response “No did not” 10 15  Besides random sampling and categorical data, what other assumption needs to be met? Is it met?

In 2014, the General Social survey was interested in studying individuals volunteering habits.They randomly selected 580 men and 689 women and then asked them if they had volunteered in the last month. Out of 580 men, 34 said that they had volunteered in the past month and out of 689 women, 37 said that they had volunteered in the past month. Suppose that you want to make a 95% confidence interval for  , what assumption is violated in this case?

A nutritionist was interested in determining if participating in a weight loss program could reduce someone’s cholesterol levels. She had 4 participants participate in a medical diet plan. She recorded their cholesterol level at the beginning of the program and at the end of the program. Find the 95% confidence interval for the population mean change in cholesterol level. (before – after)   1 2 3 4 before 230 240 220 230 after 210 225 210 240