Stats Exam Questions with All Correct Answers
A distribution of z scores are distributed in what type of unit of measurement? - Answer-Standard deviation units
A researcher finds that the average preschool-aged child drinks two cups of milk per day. Assuming these data are normally distributed,...
Stats Exam Questions with
All Correct Answers
A distribution of z scores are distributed in what type of unit of measurement? - Answer-
Standard deviation units
A researcher finds that the average preschool-aged child drinks two cups of milk per
day. Assuming these data are normally distributed, the z score for the average cups per
day in this example is - Answer-Exactly equal to 0
What is the implication for the tails of a normal distribution being asymptotic? - Answer-
that extreme scores are possible in a normal distribution
A researcher records the following times (in seconds) that it took a group of mice to
complete a maze: 23 + 4.1 (M + SD). The top 10% of mice finishing with the fastest
times will be placed in a "maze bright" group. What is the cutoff time to be placed in this
group? - Answer-28.25 seconds
Scores far from the mean are located in the ________ of a normal distribution. -
Answer-tails
The standard normal distribution is normally distributed with a mean of ____ and a
variance of ____. - Answer-any value; any positive value
A researcher measures the number of tasks completed by participants during a 5-
minute multitasking session. If the number of tasks completed is distributed normally as
6.3 + 1.0 (M + SD) tasks, then what is the probability that participants completed less
than 8 tasks? - Answer-.4554
What is the z score for scores in the bottom 10%? - Answer--1.28
The mean can take on any value and the standard deviation can take on any positive
value. Therefore, - Answer-there are an infinite number of possible normal distributions
A researcher determines that students are active about 60 + 12 (M + SD) minutes per
day. Assuming these data are normally distributed, what is the z score for students
being active 48 minutes per week? - Answer--1.0
Which of the following is NOT a characteristic of probability? - Answer-Probability is
most useful for describing fixed events.
, The normal distribution is symmetrical, which means that - Answer-scores above the
mean are distributed the same as scores below the mean
What is the z score for scores in the top and bottom 2.5%? - Answer-+1.96
What is the z score for scores in the bottom 5%? - Answer--1.645
The total number of possible outcomes for a random variable is referred to as - Answer-
the sample space
A researcher records the following times (in seconds) that it took a group of students to
complete an exam: 18±2 minutes (M±SD). How long did it take 80% of students to
complete the exam? - Answer-19.68 minutes.
The proportion or fraction of times an outcome is likely to occur is referred to as -
Answer-probability
Which of the following is required to locate z scores with a given proportion? - Answer-
both A and B
Which of the following is not a step to locate a score in a normal distribution? - Answer-
Transform a raw score (x) into a z score.
A researcher records the following response times to a visual stimulus: 23 + 3.1 (M +
SD) seconds. Assuming these data are normally distributed, what is the probability that
participants responded in 20 seconds or less? - Answer-.1660
A theoretical distribution that evenly distributes data around the mean, median, and
mode is called the - Answer-all of the above
A counselor records the number of disagreements (per session) among couples during
group counseling sessions. If the number of disagreements is distributed normally as
4.4 + 0.4 (M + SD) disagreements, then what proportion of couples disagree at least 4
times during each counseling session? - Answer-.8413
Which of the following is a possible value for the standard deviation of a normal
distribution? - Answer-.5
A professor records the following final exam scores: 78 + 7 (M + SD). Students scoring
in the top 14% get an A. What is the cutoff score for the top 14% in this example? -
Answer-85.56
The power of the decision-making process is - Answer-the likelihood of rejecting a false
null hypothesis
stated by an alpha level
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