STAT TEST 1 QUESTIONS

What is the z-score of a person whose LDL is one standard deviation above the mean? 1.0 90% 10 -1.0 10%

1.0

The 54th percentile in a large data set is 98.6. Approximately what percentage of the observations are greater than 98.6? 98.6% 46% 54% 50% 1.4%

46%

A psychologist wants to study whether there is a correlation between sleep deprivation and the diagnosis of ADD in students. She randomly selects 20 students who are diagnosed with ADD and times how long they are asleep. She found the students slept, on average, six hours a night. What is the population?a. Students diagnosed with ADDb. The students studied who didn't get enough sleepc. Everyone with sleep deprivationd. The 20 students studiede. The average of six hoursf. Studentsg. Everyone with ADD

A

The score made by a particular student on a national standardized exam is the 65th percentile. This means that His score is 65% of the average score. He got about 65% of the answers correct. No answer text provided. About 65% of all scores on the exam were higher than his. His score is the 65th best on the exam. About 65% of all scores on the exam were lower than his.

About 65% of all scores on the exam were lower than his.

Assume that the resting pulse rate for healthy adults follow a normal distribution with a mean of 69 beats per minute and a standard deviation of 9.5 beats per minute. Adam is told that the z-score of his pulse rate is -0.5. How should this statement be interpreted? Adam should see a doctor because his pulse rate is unusually low. Adam's pulse rate is about one half of a standard deviation below average. Adam's pulse rate is about one half of a standard deviation above average. Adam's pulse rate is above the mean. Exactly 5% of healthy adults have pulse rates less than Adam's pulse rate.

Adam's pulse rate is about one half of a standard deviation below average.

A professor wants to study the GPAs of students enrolled in all STAT 1222 classes at her university. She asks 15 randomly selected STAT 1222 students what their GPA is and finds the average is 3.65. What is the population? All students enrolled in STAT 1222 classes at her university The 15 randomly selected students Students enrolled at her university All STAT 1222 students anywhere

All students enrolled in STAT 1222 classes at her university

For any data set, half the data points are above the mean, and half are below. True False

False

Which of the following would NOT be an appropriate measure of central tendency when looking at incomes of a middle class neighborhood when one neighbor just sold their startup idea to Facebook for $1,000,000? Mode No other answer choice was an acceptable measure of central tendency Median All other answer choices are acceptable measures of central tendency Mean

Mean

A geographer randomly selects twenty points in a county to study the elevation. One point is on a large hill while the other points are near water level. How does the mean compare to the median? Impossible to tell without further information Mean > Median Mean < Median Mean = Median

Mean > Median

Hair color

Nominal

Military Rank

Ordinal

Identify the following as either qualitative, quantitative discrete, or quantitative continuous: Body temperatures in oC Quantitative discrete Neither qualitative, quantitative discrete, or quantitative continuous Qualitative Quantitative continuous

Quantitative continuous

Identify the following as either qualitative, quantitative discrete, or quantitative continuous: Number of students responding to a survey about their names Quantitative discrete Neither qualitative, quantitative discrete, or quantitative continuous Qualitative Quantitative continuous

Quantitative discrete

Is weight in lb nominal, ordinal, interval, or ratio? Ratio Ordinal Interval Nominal

Ratio

A psychologist wants to study whether there is a correlation between sleep deprivation and the diagnosis of ADD in students. She randomly selects 20 students who are diagnosed with ADD and times how long they are asleep. She found the students slept, on average, six hours a night. What is the sample? Everyone with ADD The average of six hours Everyone with sleep deprivation The students studied who didn't get enough sleep The 20 students studied Students diagnosed with ADD Students

The 20 students studied

The mean score on a standardized math exam is 72.6; the standard deviation is 10.5. Paul is told that the z-score of his exam score is 1.2. Is Paul's score above average or below average?

above average

The Department of Education wishes to estimate the proportion of all college students who have a job off-campus. It surveyed 1600 randomly selected students; 451 had such jobs. The population of interest to the Department of Education is: all college students all college students who have a job off campus. the 451 students in the survey who have off-campus jobs. none of these answers. all 1600 students surveyed.

all college students

An observation that is radically different from the rest is called the variance the median a variant the mean the mode an outlier

an outlier

A researcher wishes to estimate the average amount spent per person by visitors to a theme park. She takes a random sample of forty visitors and obtains an average of $28 per person. The population of interest isA. the amount of money spent per person.B. the forty selected visitors.C. theme park researchers.D. $28 per person.E. visitors to the theme park

e

Temperature in celcius

interval

Which of the following statistics is least impacted by outliers? Median Variance Mean Range Mode

median

Identify the following as either qualitative, quantitative discrete, or quantitative continuous: House numbers on a particular street Quantitative Discrete Quantitative Continuous Qualitative Neither qualitative, quantitative discrete, or quantitative continuous

qualitative

Distance

ratio

All of the following are measures of central tendency EXCEPT: standard deviation mode mean median

standard deviation

A researcher wishes to estimate the average amount spent per person by visitors to a theme park. She takes a random sample of forty visitors and obtains an average of $28 per person. The population of interest is $28 per person. the amount of money spent per person. visitors to the theme park. theme park researchers. the forty selected visitors.

visitors to the theme park.