Choose the best answer. Explain why. UMUC STAT Club wanted to estimate the study
ID: 3324990 • Letter: C
Question
Choose the best answer. Explain why. UMUC STAT Club wanted to estimate the study hours of STAT 200 students. One STAT 200 section was randomly selected and all students from that section were asked to fill out the questionnaire. This type of sampling is called: (
i) cluster
(ii) convenience
(iii) systematic
(iv) stratified
2. (a) (b) A study was conducted at a local college to analyze the trend of average GPA of all students graduated from the college. According to the Registrar, the average GPA for students with economics major from the class of 2016 is 3.5. The value 3.5 is a
(i) statistic
(ii) parameter
(iii) cannot be determined
The hotel ratings are usually on a scale from 0 star to 5 stars. The level of this measurement is
(i) interval
(ii) nominal
(iii) ordinal
(iv) ratio
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
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) Here we use Cluster sampling.
2) Here we just take sample of economic major students. Quantity defined by using sample is our statistic.
option i) is correct.
3) here rating is from 0 to 5. It means order given so this is example of ordinal scale.
Option iii) ordinal scale is correct.
4) here we sampled 100 students. so degree of freedom is = 100 - 1 = 99
therefore option i) is correct.
5) alpha level is Type I error .
therfore option iii) is correct.