Suppose a test procedure about the population mean is performed, when the population is normal with ...

Suppose a test procedure about the population mean  is performed, when the population is normal with an unknown variance.
 
  If a sample of size 16 is drawn from the population and the alternative hypothesis is H1 :   0, the null hypothesis is rejected at a level  = 0.05 if either t < -2.131 or t > 2.131. Indicate whether the statement is true or false

Q. 2

What is the fixed cost associated with the number of flights provided per day?
 
  A) 240,000
  B) 180,000
  C) 60,000
  D) 120,000

Q. 3

Find a 95 confidence interval for the total amount of the 800 accounts receivable.
 
  A) 70,421  3,836.24
  B) 70,421  4,589.73
  C) 70,421  2,057.41
  D) 70,421  5,657.48

Q. 4

In Microsoft Excel, the chart that compares values across categories using vertical rectangles, is called a ________.
 
  A) clustered column chart
  B) stacked column chart
  C) 100 stacked column chart
  D) bar chart

Q. 5

When is a dummy variable used as an independent variable in a regression model?
 
  A) when the variable involved is numerical
  B) when the variable involved is categorical
  C) when the variable involved is continuous
  D) when two independent variables interact