1. A simple random sample of 20 romance novels has an average length of 250 pages long. Asume that the page count for all romance novels is Normally distributed, with a standard deviation of 90 pages. Calculate a 90% confidence interval for the mean.
1. A simple random sample of 20 romance novels has an average length of 250 pages long. Asume that the page count for all romance novels is
2. The amount of trash generated by US households (in lbs per day) is normally distributed. You take a sample of 10 people. The sample average is xbar=10.91 lbs, and the sample standard deviation is s=4.736. What is the 95% Conf. Int. for the mean?
3. A sample of 8 female college students consumes an average of 10 liters of alcohol per month, with a sample standard deviation of 3.9 liters. Monthly alcohol consumption is Normally distributed. Which of the options below is the 90% Confidence Interval for the mean?
4. What is the value of the test statistic for a test with a null hypothesis that mu = 100, Xbar = 110 the standard deviation = 10 and n = 100?
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