Sampling error occurs because:

The mean of sampling distribution of means is

When increasing our level of confidence from 95% to 99%, the interval:

Variability refers to:

Which of the following is a measure of variability

The range is the difference between:

Four students have applied to a special program and online one can be accepted. They have taken a battery of 12 tests and all have exactly the same mean score. The standard deviation of their test scores are: Student A = 3.12, Student B =4.67, Student C = 13.45, Student D = 1.45. If consistency of performance is a criteria for acceptance, which of the four students should be selected.

Standard deviation can only be used for variables measured at which level?

The mean of the squared deviations is better known as

Probability is defined as:

which of the following is TRUE of the normal distribution?

Which of the following is TRUE of probabilities

Which of the following is NOT true of the normal curve.

The normal curve is

Roughly ___% of the total area under the normal curve rests between the mean and two standard deviations in either direction

In a symmetrical distribution, what percent of the scores fall above the mean?

If 68% of the population has an IQ between 85 and 115, what is the probability of meeting a person with an IQ either higher than 115 or lower than 85?

The difference between the sample mean and the population mean is known as:

The sampling distribution of means

The standard error of the mean:

When increasing the level of confidence from 95% to 99%, we:

Research that analyses a portion of an entire population is carried out on a

In a class of 42 students, 19 are male, 23 are female, 25 are Sociology majors and 4 are married. What is probability of randomly selecting a student who is NOT a Sociology major?

In a class of 42 students, 19 are male, 23 are female, 25 are Sociology majors and 4 are married. What is probability of randomly selecting a student who is male?

The average on a standardized test on educational achievement is 600, and the standard deviation is 15. Calculate the z-score for the following individual raw score. If x = 574, z=

Based on the previous problem. The average on a standardized test on educational achievement is 600, and the standard deviatio is 1. What % of scores are below 574

A manufacturer of solar energy batteries has recently develped an energy efficient battery. He has hired a researcher to test the battery for its expected hours of sustained operation of maintaining its electric charge. The consultant is given a sample of 40 batteries to test and determines a standard deviation of 3.0 hours and a mean of 60 hours. Calculate the standard error of the mean.

A manufacturer of solar energy batteries has recently develped an energy efficient battery. He has hired a researcher to test the battery for its expected hours of sustained operation of maintaining its electric charge. The consultant is given a sample of 40 batteries to test and determines a standard deviation of 3.0 hours and a mean of 60 hours. Estimate the population mean using the 95% confidence

A manufacturer of solar energy batteries has recently develped an energy efficient battery. He has hired a researcher to test the battery for its expected hours of sustained operation of maintaining its electric charge. The consultant is given a sample of 40 batteries to test and determines a standard deviation of 3.0 hours and a mean of 60 hours. Estimate the population mean using the 99% confidence

A manufacturer of solar energy batteries has recently develped an energy efficient battery. He has hired a researcher to test the battery for its expected hours of sustained operation of maintaining its electric charge. The consultant is given a sample of 40 batteries to test and determines a standard deviation of 3.0 hours and a mean of 60 hours. Which of the following is an accurate interpretation, based on your calculated 95% and 99% confidence intervals?