Statistics- A sample of 200 high school children were asked how many

Question
1
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
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 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
1.
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
1.
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
1.
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

 

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