Question 3: An online grocery shop claims that the mean delivery time is less than 120 minutes with a standard deviation of 30 minutes. A random sample of 49 orders is delivered with a mean of 100 minutes. At 95% confidence level, is there enough evidence to support the claim?
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The claim is that the mean delivery time is less than 120 minutes. This is our alternative hypothesis (Ha). The null hypothesis (Ho) is the opposite of the alternative hypothesis. So, our hypotheses are: Ho: μ ≥ 120 Ha: μ < 120 Show more…
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