Exam 3: Univariate Population Parameters and Sample Statistics

Of elementary school students, fifty percent watch four or more hours of television per day. Which measure of central tendency does this statement represent?

The mean can be computed on all types of measurement scales of variables.

A random sample of 500 graduating graduate students who attended My University (MU) are surveyed about their graduate students experiences at MU. The lowest amount of financial aid in the form of student loans was $0.00 and the highest amount was $100,000. Which measure of variability do these values reflect?

The research director at Roll Tide school district is conducting research on the amount of money spent per child at each of the 50 schools in the district. For each school, she collects data on "how much money is spent per child" (measured in whole dollars). She computes the standard deviation for "how much money is spent per child." Is this appropriate given the measurement scale of this variable?

A statistician employed by the Central State Zoo collects data on the temperature (measured on the Fahrenheit scale) of the 100 highest attendance days at the zoo. The statistician computes the standard deviation on the 'temperature.' Is this appropriate given the measurement scale of this variable?

A random sample of 500 graduating graduate students who attended My University (MU) are surveyed about their graduate students experiences at MU. The most frequent amount of financial aid in the form of student loans was $20,000. Which measure of central tendency does this statement represent?

A research scientist at Disneyworld randomly samples 1,000 annual pass holders and collects data on the number of days they visited a Disney park using their annual pass during the past calendar year. The lowest number of days attended was 2 and the highest number of days attended was 45. Which measure of variability do these values reflect?

The Humane Society sampled 75 families who adopted pets and collected data on the type of pet adopted. Options included: a) dog; b) cat; c) rabbit; d) horse. The Humane Society computes the standard deviation on the 'type of pet adopted.' Is this appropriate given the measurement scale of this variable?

During 2007-2008, faculty and staff at My University received an 8% raise. In determining if there will be raises allocated at My University during the current year, the board of trustees asks that there be research conducted on how much variation there was in the percentage of raise allocated at similarly sized institutions across the U.S. The institutional research office contacts 100 similarly sized institutions and gathers data on the raise, measured in percentage, that they allocated during the past fiscal year. The institutional research office computes the standard deviation on the 'percentage of raise allocated.' Is this appropriate given the measurement scale of this variable?

The most frequent number of credit hours enrolled by graduate students is nine. Which measure of central tendency does this statement represent?