A grocery store takes a random sample of 200 customers. The average check-out time is 4 minutes with a standard deviation of two minutes. 1. The standard error of the mean is? 2. The 95% confidence level for the true average check-out time is? 3. A random sample of 244 observations has a mean of 10, a median of 12 and a mode of 33. The population deviation is known to equal 2.8. the 95.44% confidence interval for the population mean is? 4. The following random sample was collected: 22 33 44 6 The 80% confidence interval for the mean is? 5. A random sample of 200 people was taken. Sixty percent of the people favor President Obama. The 95% confidence interval for the true population of people who favor Obama is?
1. Define the null hypothesis. If the null hypothesis is rejected then? 2. The level of significance is the? 3. Type II error is committed when? 4. The level of significance in hypothesis testing is the probability of? 5. If n=16, mean = 75.76, s = 8.2466 H o: mean >80 H a: mean <80, the standardized test statistic equals? 6. Read the Z statistic from the normal distribution table: a. A one-tailed test(upper tail) at 87.7% confidence; Z= b. A two-tailed test at 98.4% confidence; Z=
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