You are conducting a study to determine if there is a significant difference between average adult weight of males and females (in pounds). Calculate the test-statistic, twith the following sample data. 45, 1191, s1 = 7 60, 2 190, s2 = 7 Rounded to 2 decimal places.

The height of women ages 20-29 is normally distributed, with a mean of 63.8 inches. Assume o = 2.8 inches. Are you more likely to randomly select 1 woman with a height less than 65.2 inches or are you more likely to select a sample of 23 women with a mean height less than 65.2 inches? Explain. Click the icon to view page 1 of the standard normal table. Click the icon to view page 2 of the standard normal table. What is the probability of randomly selecting 1 woman with a height less than 65.2 inches? (Round to four decimal places as needed.)

state health web site provides information on the cost-to-charge ratio (the percentage of billed charges that are actual costs to the hospital). The cost-to-charge ratios for both inpatient and outpatient care in 2002 for a sample of six hospitals of that state follow. (Use a statistical computer package to calculate the P-value. Use ?inpatient − ?outpatient. Round your test statistic to two decimal places and your P-value to three decimal places.) Hospital 2002InpatientRatio 2002OutpatientRatio 1 86 78 2 77 58 3 99 77 4 65 57 5 65 50 6 104 69 t =  df =  P-value =  Is there sufficient evidence to suggest that the mean difference cost-to-charge ratio for the state's hospitals is lower for outpatient care than for inpatient care? Use a significance level of 0.05. Yes OR No

A research scientist wishes to test the claim that the mean number of units taken by community college students is more than 8 units per semester..  She selects a simple random sample of 21 community college students.   Are the requirements to test the claim met?  Explain