Exam 3: Descriptive Statistics: Numerical Methods

In a survey of 550 randomly-selected college statistic students were surveyed on their impressions of their course,instructor and textbook.The results are as follows: Compute a point estimate of the proportion of all college statistic students who think that they had a "very ineffective" or "extremely ineffective" instructor

The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m. ).They selected 13 patrons and had them get in line between 2 and 3 p.m.Each was given a stop watch to record the time they spent in line.The times recorded were as follows (in minutes)118,124,108,116,99,120,148,118,119,121,45,130,118 What is the IQR?

The median is the measure of central tendency that divides a population or sample into four equal parts.

The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m. ).They selected 13 patrons and had them get in line between 2 and 3 p.m.Each was given a stop watch to record the time they spent in line.The times recorded were as follows (in minutes)118,124,108,116,99,120,148,118,119,121,45,130,118 What is the 90^th percentile?

Find the z-score for an IQ test score of 125 when the mean is 100 and the standard deviation is 15.

The average of the squared deviations of the individual population measurement from the population mean is the _____.

The mode is the measurement in a sample or population that occurs most frequently.

The population mean is the point estimate of the sample mean.

A quantity that measures the variation of a population or a sample relative to its mean is called the