Biology Forums - Study Force

In testing for the differences between the means of two independent populations, we assume that the 2 populations each follow a normal distribution.
 
  Indicate whether the statement is true or false

Q. 2

A 95 confidence interval estimate for a population mean  is determined to be 62.8 to 73.4. If the confidence level is reduced to 90, the confidence interval for  becomes narrower.
 
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Q. 3

In multiple regression models, the values of the error variable  are assumed to be:
 
  A) autocorrelated.
  B) dependent of each other.
  C) independent of each other.
  D) always positive.

Q. 4

The correlation coefficient r is a number that indicates the direction and the strength of the relationship between two random variables.
 
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Q. 5

The measure that examines the location of a data value relative to the mean of the distribution is called a z-score.
 
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