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25 who sleep for at least 8 hours per night. This is describing a Construct a 95% confidence interval to estimate the expected lifespan of a television. This is describing a Students from a statistics class were asked how long they studied for the most recent test. The results indicated an average of 3.5 hours with a standard deviation of 0.7 hours. Write a 90% confidence interval to estimate the parameter. This is describing a After testing 300 products made at a certain factory and finding only two that did not work, Ahmad expects that at least 99% of the products made in the factory should work properly. Conduct a hypothesis test to determining the validity of Ahmad's claim. This is describing a Julie claims that more than half of her class earned an A on their last test. Test her claim with a significance level of a = 0.05. This is describing a V population proportion Check population mean