A company claims that the mean weight of apples in their shipment is 150 grams. A sample of 25 apples has an average weight of 145 grams. The standard deviation is 10 grams. Which of the following represents the correct null hypothesis?, . H₀: μ < 150, H₀: μ = 150, H₀: μ ≠ 150, H₀: μ > 145, A school wants to test whether the average score of students in a Math exam is different from 75. Which type of hypothesis test should be used?, Left-tailed test, Right-tailed test, Two-tailed test, No test needed, A sample of batteries shows a mean life of 5.5 months. The company claims that batteries last at least 6 months. If the test statistic falls in the rejection region, the correct decision is:, Accept the null hypothesis, Reject the null hypothesis, Increase the sample size, Decrease the significance level, A researcher tests whether the average waiting time at a clinic is less than 30 minutes. After analysis, there is insufficient evidence to reject the null hypothesis. Which conclusion is correct?, The average waiting time is definitely 30 minutes., The average waiting time is more than 30 minutes., The claim that the average waiting time is 30 minutes cannot be rejected., The average waiting time is exactly 25 minutes., A test statistic is 2.10, and the critical value for α = 0.05 is ±1.96. Which statement is correct?, The test statistic is inside the rejection region; reject H₀., The test statistic is outside the rejection region; reject H₀., The test statistic is inside the rejection region; fail to reject H₀., The test statistic is outside the rejection region; fail to reject H₀.

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