Question 1: A sample of 200 high school children were asked how many tweets they sent per month. It was found that the average number of tweets per month per child was 1,500. From Twitter Research Inc., we know that the population standard deviation is 250. If you were to construct a 75% confidence interval for the mean number of texts per month per child, what would be the absolute value of the Z value?

• 1.15
• .67
• .60
• .55

Question 2: A sample of 200 high school children were asked how many tweets they sent per month. It was found that the average number of tweets per month per child was 1,500. From Twitter Research Inc., we know that the population standard deviation is 250. If you were to construct a 85% confidence interval for the mean number of texts per month per child, what would be the value of the lower limit of the confidence interval?

• 1140
• 1482
• 1518
• 1475

Question 3: A confidence interval for the average age of Walmart shoppers can be found below. On the basis of the confidence interval shown below, you can (or should) conclude that the average age of Walmart shoppers is over 52.

• True
• False

Question 4: A confidence interval for the average age of Walmart shoppers can be found below. On the basis of the confidence interval shown below, you can (or should) conclude that the average age of Walmart shoppers is less than 52.

• True
• False

Question 5: A confidence interval for the average age of Walmart shoppers can be found below. On the basis of the confidence interval shown below, you can (or should) conclude that the average age of Walmart shoppers is more than 44.

• True
• False