MISY262 FINAL UPDATED Exam Questions and CORRECT Answers
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Course
MISY262
Institution
MISY262
MISY262 FINAL UPDATED Exam
Questions and CORRECT Answers
which of the following statements is true about variables?
1.Nominal variables are expressed by numbers
2.A variable is something that can be measured but does not vary
3.Typically, we have two kinds of variables: discrete and continu...
MISY262 FINAL UPDATED Exam
Questions and CORRECT Answers
which of the following statements is true about variables?
1.Nominal variables are expressed by numbers
2.A variable is something that can be measured but does not vary
3.Typically, we have two kinds of variables: discrete and continuous
4.Categorical variables are not discrete - Correct Answer- typically we have two kinds of
variables continuous and discrete
which of the following variables is NOT a discrete variable?
1.Review out of 5 stars for service at the DMV
2.Average temperature across counties in Arizona
3.Number of "heads" in five coin flips
4.Number of moons around a planet - Correct Answer- average temperature across counties
in Arizona
which of the following is a discrete variable?
1.Weight of students in class
2.Distance traveled between classes
3.Number of red marbles in a jar
4.Time it takes to get to school - Correct Answer- number of red marbles in a jar
which of the following is a continuos variable?
1.Number of "heads" when flipping three coins
2.Height of students in class
3.Students' final letter grades
4.Number of students present - Correct Answer- height of students in a class
,which of the following statements is true about the median and the mean?
1.The mean is the middle number in a sorted set of observations
2.Median is a measure of the variation in a distribution
3.Extreme observations do not affect calculation of the median
4.If there is no middle number of a list of numbers, then we can say that the list does not have
a median - Correct Answer- extreme observations do not affect the calculation of the median
which of the following statements is true?
1.Standard deviation is the mean distance of the observations from their median
2.Standard deviation is a measure of center for a random variable
3.Mean and median are measures of center for a random variable
4.Histograms are different from frequency distributions - Correct Answer- mean and median
are measures of center for a random variable
which of the following statements is true about percentiles?
1.The 50th percentile is the mean of a distribution
2.The 25th percentile divides the data into two parts: 25% of the data at or above its value
and 75% at or below its value
3.Percentiles are a quick way to understand the mean of a distribution without generating a
chart
4.The 50th percentile is the median of a distribution and divides the data into two equal parts
- Correct Answer- the 50th percentile is the median of a distribution and divides the data into
two equal parts
which of the following statements is true about populations and samples?
1.In most cases, we shouldn't worry about making sure our sample is randomly selected
2.Sometimes, the sample average we measured does not agree with the population average
, 3.The sample average always agrees with population average
4.When we use random sample, it will eliminate potential bias completely - Correct Answer-
sometimes the sample average, does not agree with the population average
which of the following is true about probability distributions?
1.The chi-square distribution is not related to the t-distribution
2.A probability distribution shows the likelihood of occurrence of specific outcomes of a
random variable
3.The normal distribution and the T distribution have extremely different shapes
4.μ is the symbol for the true standard deviation and sigma is the symbol for the true mean of
a distribution - Correct Answer- a probability distribution shows the likelihood of occurrence
of specific outcomes of a random variable
which of the following statements is true about charts?
1.Charts can help us understand individual variables' distributions but cannot help us
understand the relationships among variables
2.Scatter plots help us to see the frequency distribution of a variable
3.Histograms help us understand how variables behave together
4.Charts can help us understand individual variables' distributions and relationships among
variables - Correct Answer- charts can help us understand individual variables distributions
and relationships among variables
which of the following statements is not true about scatterplots?
1.We don't need scatterplots; we can get the information we need from means, medians, and
standard deviations
2.Once we can measure things, we can better manage them
3.Scatterplots show the relationship between two variables
4.In a scatterplot, a single dot represents the values of the two variables we're looking at for a
single observation - Correct Answer- we don't need scatterplots; we can get the information
we need from the mean, median, and standard deviations
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