Is the amount of sleep that Americans get more than 8 hours per day? In 2013, the Bureau of Labor Statistics, conducted a survey. They asked the participants to make a diary of what they did during a 24 hours period. The sample size was 150. The sample mean amount of sleep was 8.74 hours and the sample standard deviation was 2.4. What is the test statistic?

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” 40 15   What is the sample proportion of people who responded “No, they did not consume at least 24 ounces of water” initially?

Have people changed their opinion about badminton in the United States in the past decade? The same 1000 people were asked if they favored playing badminton in 2000 and in 2010. The initial 1000 people were randomly selected from the United States. What would be the correct alternative hypothesis? (Let 2000 be group 1 and 2010 be group 2.) 

In 2015, the mean income of all adults living in Arizona was 52248. The standard deviation was 6,500. Suppose that a sample of 50 participants is taken. What would be mean and standard error of the sampling distribution of the sample mean?

Have people changed their opinion about legalized gambling in Canada in the past decade? The same 1000 people were asked if they favored legalized gambling in 2000 and in 2010. The initial 1000 people were randomly selected from Canada. What would be the correct alternative hypothesis? (Let 2000 be group 1 and 2010 be group 2.) 

A group of 100 students were asked whether or not they had eaten out at a restaurant within the past week.  Is the population proportion of underclassmen(1) who ate out at a restaurant within the past week the different from the population proportion of upperclassmen(2) who ate out at a restaurant within the past week? What would be the correct alternative hypothesis?

Have people changed their opinion about football in the United States in the past decade? The same 1000 people were asked if they favored playing football in 2000 and in 2010. The initial 1000 people were randomly selected from the United States. What would be the correct alternative hypothesis? (Let 2000 be group 1 and 2010 be group 2.) 

 Is the amount of sleep that Americans get more than 8 hours per day? In 2013, the Bureau of Labor Statistics, conducted a survey. They asked the participants to make a diary of what they did during a 24 hours period. The sample size was 104. The sample mean amount of sleep was 8.74 hours and the sample standard deviation was 2.4. What is the test statistic?

In 2014, the General Social Survey asked respondents if they felt that 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?

Suppose that you wanted to estimate the population mean amount spent on snacks purchased at vending machines. In 2010, a survey found the sample standard deviation was 15 dollars. What size sample would you need to collect in order to make a 95% confidence interval with a margin of error of 2.25 dollars?