1. 500 students took a chemistry test. You sampled 100 students to estimate the

Question

1. 500 students took a chemistry test. You sampled 100 students to estimate the average score and the standard deviation. How many degrees of freedom were there in the estimation of the standard deviation?

(i)            99

(ii)           100

(iii)          499

(iv)          500

2. You choose an alpha level of 0.01 and then analyze your data. What is the probability that you will make a Type I error given that the null hypothesis is true?

(i)            0.025

(ii)           0.05

(iii)          0.01

(iv)          0.10

Explanation / Answer

#1.
Sample size, n = 100
Degrees of freedom, df = n - 1 = 100 - 1 = 99

Option (i) is correct

#2.
Type I error is equals to the significance level.
Here significance level = 0.01

Hence type I error = 0.01

Option (iii) is correct

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