Devry Math 221 Week 7 Quiz

Devry Math 221 Week 7 Quiz - 1. Question: (TCO 6) In the...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1. Question: (TCO 6) In the standard normal distribution, the standard deviation is always Your Answer: 0 1 ( Ch 5: By definition, the standard deviation = 1. ) CORREC T 2 none of these Points Received: 5 of 5 2. Question: (TCO 6) The area under a normal curve with mu = 15 and sigma = 2 is Your Answer: 0 1 ( Ch 5: The total area under ANY normal probability distribution is always 1. ) CORREC T 2 none of these Points Received: 5 of 5 3. Question: (TCO 6) If John gets an 80 on a physics test where the mean is 85 and the standard deviation is 3, where does he stand in relation to his classmates? Your Answer: He is in the top 5%. He is in the top 10%. He is in the bottom 5%. ( Ch 5: z = (80 – 85)/3 = -1.67. Area to the left is 0.0475. Thus, 4.75% of test scores are below 80. ) CORREC T He is the bottom 1%. Points Received: 5 of 5 4. Question: (TCO 6) In a normal distribution with mu = 25 and sigma = 3, what number corresponds to z = -3? Your Answer: 16 ( Ch 5: x = mu + z * sigma, so x = 16 ) CORREC T 18 20
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
none of these Points Received: 5 of 5 5. Question: (TCO 6) Let’s assume you have taken 100 samples of size 36 each from a normally distributed population. Calculate the standard deviation of the sample means if the population’s variance is 25. Your Answer:
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/19/2011 for the course MATH 221 SUMMER taught by Professor Lipper during the Summer '11 term at DeVry NJ.

Page1 / 5

Devry Math 221 Week 7 Quiz - 1. Question: (TCO 6) In the...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online