Statistics Algebra

A study took a group of adults and randomly divided them into two groups. One group was told to drink tea every night for a week, while the other group was told not to drink tea that week. Researchers then compared when each group feel asleep.

• Observational study

• Experimental study

• Survey

• Random

The following data shows the average high temperature of a city each month in 2016. {31,33,42,55,67,75,80,78,71,59,48,36}

• The upper quartile is 80.

• The range is 50.

• The median is 58.

• The lower quartile is 39.

The wind speeds throughout the month of April were normally distributed with a mean of 17mph and a standard deviation of 4mph. What percent of the days had wind speeds of at least 9mph?

• 68%

• 16%

• 97.7%

• 2.5%

The daily high temperatures in Philadelphia for the first 15 days in February is normally distributed with a standard deviation of 2.5 degrees. If it was 37 degrees on Valentine's Day with a z-score of 2.4, find the mean temperature.

• 31 degrees

• 37 degrees

• 32 degrees

• 35 degrees

The number of point scored by each team in the NHL at the end of the season is normally distributed with a mean of 89 and standard deviation of 11. Find P(x<85).

• 97%

• 35.9%

• 9.7%

• 36%

The following data shows the average high temperature of a city each month in 2016. {31,33,42,55,67,75,80,78,71,59,48,36} What is the interquaritile range? (IQR)

• 34

• 50

• 73

• 39

Suppose you want to know the average amount of time a student spends on homework in a week. Due to the large number of students, you only survey 120 of them. Of the 120 students, the average time spent on homework in a week is 6 hours. Which of the following represents the sample?

• 6 hours

• 120 students

• the average amount of time spent on homework by all students

• all students

Suppose you want to know the average amount of time a student spends on homework in a week. Due to the large number of students, you only survey 120 of them. Of the 120 students, the average time spent on homework in a week is 6 hours. Which of the following represents the population?

• 6 hours

• 120 students

• the average amount of time spent on homework by all students

• all students

Suppose you want to know the average amount of time a student spends on homework in a week. Due to the large number of students, you only survey 120 of them. Of the 120 students, the average time spent on homework in a week is 6 hours. Which of the following represents the parameter?

• 6 hours

• 120 students

• the average amount of time spent on homework by all students

• all students

Suppose you want to know the average amount of time a student spends on homework in a week. Due to the large number of students, you only survey 120 of them. Of the 120 students, the average time spent on homework in a week is 6 hours. Which of the following represents the statistic?

• 6 hours

• 120 students

• the average amount of time spent on homework by all students

• all students