Is there a difference in the attitude scores (1-10) about learning statistics between underclassmen and upperclassmen students?  What would be the correct alternative hypothesis?

A nutritionist was interested in studying American’s opinions about healthy eating. One hundred randomly selected people who were starting a diet were asked if they ate five servings of fruit or vegetables a day. After six months, the same 100 people were asked if they ate five servings of fruit or vegetables a day.   Six months later “Yes, ate 5 servings” Six months later “No, did not eat five servings” Initial Response “Yes, ate five servings” 20 50 Initial Response “No did not eat five servings” 17 13  What is the sample proportion that ate 5 servings a day initially?

A nutritionist was interested in studying American’s opinions about healthy eating. One hundred randomly selected people who were starting a diet were 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” 26 15 Initial Response “No did not” 17 42

A study was done to see if students who took AP Calculus  before taking the AP statistics course did better than students who did not take AP Calculus. They wanted to see if there was a difference in the AP Statistics exam scores. The p-value was 1.0. What does this mean?

Researchers want to determine if there is a connection between choice of musical instruments and gender. They want to see if the proportion of men (m) who play the flute is different from the proportion of women (f) who play the flute. They find that the p-value is 0.11.   What can be said about the 99% confidence interval for the population mean difference?

Do less men(m) then women(f) enroll in engineering courses? What would be the correct alternative hypothesis?

A nutritionist was interested in studying American’s opinions about healthy eating. One hundred randomly selected people who were starting a diet were asked if they ate five servings of fruit and vegetables every day. After six months, the same 100 people were asked if they ate five servings of fruits and vegetables a day. What is the value of the test statistic?   Six months later “Yes, ate five servings of fruit and vegetables” Six months later “No, did not” Initial Response “Yes, ate five servings” 17 18 Initial Response “No did not” 46 19

Suppose that a doctor wants to determine if a new exercise plan helps lower participants’ blood pressure levels. The blood pressure level for each participant is recorded for each participant before beginning the program. Each of the participants then participates in the new exercise plan for 6 weeks. Then blood pressure is then taken again. Let mu_d = the average blood pressure before – average blood pressure after. What is the correct alternative hypothesis?

In 2012, the General Social survey was interested in studying individuals volunteering habits.Then, they randomly selected 592 men and 702 women and then asked them if they had volunteered in the last month. Out of 592 men, 32 said that they had volunteered in the past month and out of 702 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?

In 2014, the General Social Survey asked respondents if they  had completed a stress management program in the past 12 months. Out of a random selection of 151 Republicans (group 1), 21 said yes. Out of 83 Independents (group 2), 16 said yes. Suppose that a significance test for Ho:p1-p2=0 versus Ha:p1-p2 does not equal 0 was computed. What would be the pooled proportion?