11 Stat Reviewer

Which of the following is a discrete random variable?

• The number of patients in a hospital

• The average weight of female athletes.

• The average amount of electricity consumed

• The amount of paint used in repainting a building.

Which of the following statements is correct?

• The means of the samples drawn from a population maybe equal, greater than or less than the population mean.

• The mean of the sampling distribution of the sample mean is greater than the population mean

• The mean of the sampling distribution of the mean is less than the population mean.

• The mean of the samples drawn from a population are always equal to the population mean

Probability distribution is generated by what?

• Frequency

• Mean

• Population

• Sample

A certain population has a mean of 1.4 and a standard deviation of 5.6. if random samples of size 5 is taken from this population, which of the following statements is correct?

• The standard deviation of the sampling distribution of the sample mean is 5.6

• The standard deviation of the sampling distribution of the sample means is 15.4

• The mean of the sampling distribution of the sample mean is less than 15.4

• The mean of the sampling distribution of the sample mean is equal to 15.4

In statistics, errors refers to what?

• a mistake resulting in wrong decisions

• difference between an observed value and parameter

• difference between two parameter values

• mistakes resulting from computation

Which of the following symbols denotes population standard deviation?

• X   

• σ                      

• μ                       

• s

If two coins are tossed, which is not possible value of the random variable for the number of heads?

• 0   

• 1                       

• 2               

• 3

What does a sample of a population mean?

• another list

• description

• list

• subset

The distance between a given measurement X and the mean expressed in standard deviation is known as what?

• raw score

• variable

• z score

• z-table

What do you call a number describes a population characteristic?

• decimal

• parameter

• sample statistics

• variable