Author Question: The income range of attendees at a research conference is gathered as upper, middle, and low ... (Read 98 times)

james0929 · **on:** Aug 1, 2018

The income range of attendees at a research conference is gathered as upper, middle,
and low levels. What type of data is collected?

A) Nominal
B) Ordinal
C) Interval
D) Ratio

Question 2

For randomly selected adults, IQ scores are normally distributed with a standard deviation of 15.

The scores of 14 randomly selected college students are listed below. Use a 0.10 significance level to test the claim that the standard deviation of IQ scores of college students is less than 15.
115 128 107 109 116 124 135
127 115 104 118 126 129 133

Yixagurpuldink · **Reply #1 on:** Aug 1, 2018

Answer to Question 1

Thanks for sharing, assignments makes me feel like end of world..

Answer to Question 2

Test statistic: X2 = 5.571. Critical values: X2 = 7.042. Reject . There is sufficient evidence to support the claim that IQ scores of college students have a standard deviation smaller than 15.