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

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” 25 20 Initial Response “No did not” 30 25   What is the sample proportion of people who responded “Yes, they consumed at least 24 ounces of water” six months later?

Is the mean nursing salary for men and women with similar experience statistically significantly different? A significance test was conducted to test this claim. The p-value was 0.07. What can be said about the 95% confidence interval for the population mean difference?

Two hundred people were randomly selected in the year 2010 (group 1) and in the year 2012 group 2). They were asked how many hours a day they spent on a digital device (online, mobile, or other). The sample mean in 2010 was 3.14 hours and in 2012 it was 4.31 hours. What is the point estimate of the population mean difference between 2010 and 2012?

A press organization was interested in studying people’s voting habits. One hundred randomly selected registered voters over the age of 50 and one hundred randomly selected voters between the ages of 30 and 50 were asked if they had decided who they were going to vote for in the presidential election.  Would this be an example of independent or dependent samples?

For the hypothesis statements, Ho:p1-p2=0 versus Ha:p1-p2 > 0 if the TS equals 2.3, what is the p-value?  

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?