Hypothesis Testing

When do you use a t-value instead of a z-value? 

• When n < 30
• When n ≥ 30
• When all of the planets align
• When Ms. O said to

Which of the following is not an option for an alternate hypothesis? 

• H_a = k
• H_a > k
• H_a < k
• H_a ≠ k

What is the only option for the null hypothesis? 

• H₀ = k
• H₀ > k
• H₀ < k
• H₀ ≠ k

Given the claim: The average grade of grade 11 students in Science exceeds 85 points.

What is the alternative hypothesis?

• The average grade of grade 11 students in Science is less than 85 points.
• The average grade of grade 11 students in Science is greater than 85 points.
• The average grade of grade 11 students in Science is equal to 85 points.
• The average grade of grade 11 students in Science is at least 90 points.

Given the claim: The average number of daily customer of Store A is higher than Store B.

What is the alternative hypothesis?

• The average number of daily customers of Store A is equal to the average number of daily customers of Store B.
• The average number of daily customers of Store B is greater than the average number of daily customers of Store A.
• The average number of daily customers of Store A is greater than the average number of daily customers of Store B.
• The average number of daily customers of Store A is less than the average number of daily customers of Store B.

In a hypothesis testing, the alternative hypothesis is "the average expenses is less than 10000". If the level of significance is 0.01, what is the Critical value?

• -2.33
• 1.64
• -2.58

• -1.96

In a hypothesis testing scenario, the null hypothesis states that "the average salary of employees is equal to 50000". If the level of significance is 0.05, what is the Critical value for a two-tailed test?

• 2.58

• -1.64

• 2.33

• 1.96

Given the claim: The average time spent on homework by high school students is less than 2 hours per day.

What is the null hypothesis?

• The average time spent on homework by high school students is greater than or equal to 2 hours per day.

• The average time spent on homework by high school students is less than 2 hours per day.

• The average time spent on homework by high school students is at most 1.5 hours per day.

• The average time spent on homework by high school students is exactly 2 hours per day.

Given the claim: The average weight of apples in Orchard A is heavier than in Orchard B.

What is the null hypothesis?

• The average weight of apples in Orchard A is at least equal to the average weight of apples in Orchard B.

• The average weight of apples in Orchard A is less than the average weight of apples in Orchard B.

• The average weight of apples in Orchard B is heavier than the average weight of apples in Orchard A.

• The average weight of apples in Orchard A is equal to the average weight of apples in Orchard B.

What is the correct decision of the results below?

Ho: µ=50

    H1: µ>50

α=0.05

Test value = 1.45

Critical Value =1.65

• Fail to accept Ho
• Reject Ho
• Accept H1
• Fail to reject Ho