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Author Question: Most problems involving normally distributed variables are one of two types.Type A: Find a ... (Read 98 times)

asmith134

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on: Apr 7, 2020

Question 1

True or false, areas under the standard normal curve cannot be negative, whereas z-scores can be positive or negative.
◦ True
◦ False

Question 2

Most problems involving normally distributed variables are one of two types.

Type A: Find a probability or percentage, e.g. find the probability that X lies in a specified range.

Type B: Find the observation corresponding to a given probability or percentage.

Suppose that scores on a test are normally distributed with a mean of 80 and a standard deviation of 8. Which of the following questions below are of type B?

a. Find the 80th percentile.
b. Find the cutoff for the A grade if the top 10% get an A.
c. Find the percentage scoring more than 90.
d. Find the score that separates the bottom 30% from the top 70%.
e. Find the probability that a randomly selected student will score more than 80.

◦ a, b, c, d
◦ c, e
◦ b, d
◦ a, b, d
Introductory Statistics ¦ Weiss ¦ 10th Edition
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Marked as best answer by asmith134 on Apr 7, 2020

johnharpe

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Reply #1 on: Apr 7, 2020
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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asmith134

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Reply 2 on: Apr 7, 2020
:D TYSM

vickybb89

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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