Teacher Joy conducted a census in her class and she found out that the average time spent for studying is 2.25 hours, average height is 147 cm, and a random sample of 10 students got an average grade of 87%. Which is the statistic? A. 2.25 hours B. 10 students C. 87% D. 147 cm
1. Teacher Joy conducted a census in her class and she found out that the average time spent for studying is 2.25 hours, average height is 147 cm, and a random sample of 10 students got an average grade of 87%. Which is the statistic?
A. 2.25 hours
B. 10 students
C. 87%
D. 147 cm
2.. Suppose the null hypothesis states that the mean is less than or equal to 50 kg and the alternative hypothesis states that the mean is greater than 50 kg. Which of the following would commit Type I error?
A. Conclude that µ = 50 kg when the truth is µ > 50 kg.
B. Conclude that µ > 50 kg when the truth is µ = 50 kg.
C. Conclude that µ = 50 kg when the truth is µ < 50 kg.
D. Conclude that µ < 50 kg when the truth is µ = 50 kg.
3. What variable can the researcher freely manipulate in a study?
A. dependent variable
B. independent variable
C. both the independent and dependent variable
D. neither the independent nor the dependent variable
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