Chapter 1. BPS_Tutorial_Ch14_Confidence_Intervals_Basics_Part2

1.1 Problem Statement

{25,30,35,40}
rand(0,3)
@sample[$sampleindex]
{95,100,105,110}
rand(0,3)
@samplem[$samplemindex]
{10,11,12,13,14,15,16,17,18,19,20}
rand (0,10)
@stddeviq[$stddeviqindex]
$stddeviq/sqrt($sample)
2*$sdsm
$samplem-$marginoferror
$samplem+$marginoferror

A sample of $sample seventh-grade students in school district gave a sample mean of $samplem. It is known that the standard deviation of individual IQ scores is $stddeviq points.

1.2 Step 1

questions

Question 1.1

The sample size is zGjSqDXNbNIcpbyKtzbe3KCjkuc=.

Correct.
Incorrect.

Question 1.2

The population size is zGjSqDXNbNIcpbyKtzbe3KCjkuc=.

Correct.
Incorrect.

Question 1.3

The sample mean IQ is xK0Aan9P85uGuBb6FXAgQrbv8r/AFqa0.

Correct.
Incorrect.

Question 1.4

The true population mean IQ is w92w0+WJMIvMCnEqoHFDWEyhS7yuZrGy

Correct.
Incorrect.

1.3 Step 2

questions

Question 1.5

DvXq6TXt1ba/9HpQDdHnxeqBu+FliUKQ63wc0aru/giphWx9g4DKARye0Yi82H6uNb7CJE5xC6kBo3eer4Jimn/+1UrY/4BP
Correct.
Incorrect.

Question 1.6

7vQzGPPSmUN+o5M3HmUEL4HAJvYASzUXKHDYJ5ax3l2TrhqPeY0h7PtVcVpgE95iEU0n+oTesfCC4JqwNkxqFjQ5SC2bjfz7KNTJpGfbYxeIpE0GlQMeKx+Y5lKS7Gt9fJTD6Af1ulo=
Correct.
Incorrect.

Question 1.7

The 68-95-99.7 rule for Normal distributions says that about 95% of the probability is within viONEQg/IQeWTS2b standard deviations of the mean.

Correct.
Incorrect.

Question 1.8

Mqz6C3lQudPDJqTFfVDhP/MV3rp9t8kV9TEZc0MrjbN5QlXwnf5oz/FZiJ15mwZ7ea9vQUHgbXKQewaBhiHui/aF90VmY57UHUNDpkmT8UL1y9qKfgKjJGB0SGNP6jrhLBo6Xv4M9G5t2r5ihmlhupZdBnyo+W+t3K7EIvuXCIw=
Correct.
Incorrect.

1.4 Step 3

questions

Question 1.9

The 95% confidence interval for the mean IQ of seventh-grade students is from j1zwxAesmoE= to Sdfro4d5nlo=.

Correct.
Incorrect.

Question 1.10

8+IaZ74s/5Wb6MHt6mTXnePbW9oEmkNISN098JLfkrAKhkXYjXCQOlXQmL+78Q9/JQoQJQ6TrejcBpCek/6fEpWLHfLeMtSDPHsLwgHRydUNSwqn0dEEY9J3Bevl3TwMtlHygTkSyzJPseOqT3wqDbbKWjEHqIOseb17G/DCG65ZTcu9lLlG4d4buVQCMfnCSYNhXJapws/Ly/iPhMfnfimzLLQfk3HhldyKnXGYW27XddR2p53MQi+a84skVukBOuS/gs7s7dgEX89e0wTlmWvd3y3w0/n5/7fWO/fWEdza/vwNVcqRSucRcQjxOV32Z1GspKQFvnxHxNMguAUEGN49qWiqKhUngThEA7FkU3soP4EgXHh2TzWsOWt6EVvp6BKYQ+faQNF5Nq5pVbe3yfiQTKCkDrNYCYy0zvvesBI=
Correct.
Incorrect.