Blog

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 0.005.   What can be said about the 90% confidence interval for the population mean difference?

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” initially?

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

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?

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.   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   What is the sample proportion of people who responded “Yes, they ate whole grains” initially?

An informed home owner wants to test samples of water in their home to ensure that the average amount of mercury is less than 2 ppb. What would be the appropriate alternative hypothesis?

 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 hour 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?

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

Is there a difference in the population mean time spent watching tv per day for men and women? The p-value was 0.11. What can be said about the 90% confidence interval for the population mean difference?

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 90% confidence interval for the population mean difference?