A political scientist is interested in studying how Americans feel about having a female American president. He asks 100 people under the age of 40 and 100 people over the age of 40 if they would vote for a women president. The political scientist hypothesized that younger age group(1) would  be more likely to vote for a women president than the older age group(2). What would be the correct null and alternative hypothesis?

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 95% confidence interval for the population mean difference?

An instructor was interested in studying students satisfactory solving of a math problem. The students were given a math problem to solve before and after instruction. Each time, the student was given either a “S” for satisfactory completion or “U” for unsatisfactory completion. Two hundred randomly selected students were involved in the study. “S” after instruction “U” after instruction “S” before instruction 53 18 “U” before instruction 58 71  Besides random sampling and categorical data, what other assumption needs to be met? Is it met?

A scientist was interested in determining if the Paleo diet plan worked.  They randomly selected 4 people that were interested in trying a new diet plan. They recorded their initial weights before starting the diet plan. After six weeks, their weight was taken again. How would you check the normality assumptions for this test?     1 2 3 4 Initial weight 170 160 130 200 Weight six weeks later 162 157 124 190  

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” 20 20 Initial Response “No did not” 16 44  

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 0.03. What can be said about the 95% confidence interval for the population mean difference?

A political scientist is interested in studying how Americans feel about having a female American president. He asks 100 liberals and 100 conservatives if they would vote for a women president. The political scientist hypothesized that more liberals(1) would vote for a women president than conservatives(2). What would be the correct null and 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” 50 4 Initial Response “No did not” 10 36  Besides random sampling, what other assumption needs to be met? Is it met?

A vice principal at a high school was studying ACT scores at a local university. She found the following 95% confidence interval for the population mean score for ACT scores: (28, 32). She also conducted a significance test at Ho: mu = 30 versus Ha: mu does not equal 30. The p-value for this test was 0.17.   Which of the following statements accurately describes this situation?

A press organization was interested in studying how people’s voting habits change over the course of an election year. The same one hundred randomly selected registered voters were asked 3 and 6 months out 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?