A sample of n=25 individuals is selected from apopulation with µ:80 the sample. If the treatrnent has a large effect, then _.

a. the sample mean should be very different frorn 80 and should lead you to reject the null

hypothesis

b. the sample mean should be very different from 80 and should lead you to fail to reject

the null hypotliesis

c. the sample mean sliould be close to 80 and should lead you to reject the null hypothesis

d. the sample mean should be close 80 and should lead you to fail to reject the null

hypothesis

An internet company charges $8.95 per month for the first 3 months that it hosts your web site. then the company charges $11.95 per month for web hosting. how much money, in dollars, will the company charge for 8 months of web hosting?

Arandomized controlled trial is designed to evaluate the effect of metoprolol in patients with heart failure. while preparing for statistical analysis, the researcher reviews some common types of statistical errors. which of the following statements is true regarding a type i error in a clinical study? a. the study is not significantly powered to detect a true difference between study groups. bthe null hypothesis is true but is rejected in error. c. the null hypothesis is false but is accepted in error. d. type i error is also known as beta and is usually 0.1 or 0.2. e. type i error depends on the study's confidence interval.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?