Deck 19: Introduction to Hypothesis Testing

Question 1

What type of hypothesis states that the true difference between the means in the population is zero?

A) Null hypothesis
B) Alternative hypothesis
C) Directional research hypothesis
D) Research hypothesis

Answer 1

A

Question 2

the null hypothesis is a possible explanation for an observed difference when there are sampling errors.

Answer 2

True

Question 3

What does the following expression represent, where µ₁ is the symbol for the population mean for one group and µ₂ is the symbol for the population mean for the other group?
H₁: µ₁ ≠ µ₂

A) Null hypothesis
B) Alternative hypothesis
C) Directional research hypothesis
D) Research hypothesis

Answer 3

B

Question 4

What type of hypothesis states that one particular group's average is higher than the other group's?

A) Null hypothesis
B) Non-directional research hypothesis
C) Directional research hypothesis
D) Research hypothesis

Question 5

What does the following expression represent, where µ₁ is the symbol for the population mean for one group and µ₂ is the symbol for the population mean for the other group?
H₁: µ₁ > µ₂

A) Null hypothesis
B) Non-directional research hypothesis
C) Directional research hypothesis
D) Research hypothesis

Question 6

Which of the following expressions indicates that there is a difference between two means being compared?

A) H₀: µ₁ − µ₂ = 0
B) H₁: µ₁ > µ₂
C) H₁: µ₁ ≠ µ₂

Question 7

Which hypothesis states that a mean difference between two groups is due to sampling error?

A) Null Hypothesis
B) Alternative Hypothesis
C) Directional Hypothesis
D) Nondirectional Hypothesis

Question 8

Which statement is NOT true about a null hypothesis?

A) The true difference between the means (in the population) is zero
B) There is no true difference between the means
C) The observed difference between the sample means was created by sampling error
D) The girls achieved a higher mean in reading than boys

Question 9

Which symbol shows two-tailed hypothesis test?

A) H₁: μ₁ < μ₂
B) H₁: μ₁ > μ₂
C) H₁: μ₁ ≠ μ₂

Question 10

Which symbol shows that there is no difference between two means?

A) H₁: μ₁ < μ₂
B) H₁: μ₁ > μ₂
C) H₁: μ₁ ≠ μ₂
D) Ho: μ₁- μ₂ = 0

Question 11

In each of the following situations, please identify the NULL HYPOTHESIS and the ALTERNATIVE HYPOTHESIS
A group of 100 athletes were randomly chosen to try a new energy drink. Among them, 50 athletes were given the new energy drink and the remaining 50 athletes were given a placebo drink. The 50 athletes with the new energy drink reported having more energy while only 30 athletes given a placebo drink reported to have more energy.
a. The energy drink gave the athletes more energy. ____________________
b. Overall, there is no significant difference in the energy level between the two groups. ____________________________