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Stat 345 Exam 1 Questions with Correct Answer1
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Stat 345 Exam 1 Questions with Correct Answer1
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Stat 345 Exam 1 Questions with Correct AnswersIf an event has probability equal to zero Correct Answer-When an event
will not occur?
Steps in scientific research Correct Answer-1. Encounter a problem or
research question
2. Make predictions and define measures
3. Think through the consequences of the predictions and choice of
measures
4. Design and run study, collect data compute statistics, and make
decisions about whether the results support the predictions
5. Draw conclusion, identify limitations, think ahead and to the next step
in studying the topic
What is conventional level of probability (eg.) alpha level that is often
accepted when conducting statistical tests? Correct Answer-0.5
The value of a data set that occurs most frequently Correct Answer-
Mode
A statistical analysis of a study attempts to____the population heart rate
Correct Answer-estimate
The basic assumption of homogeneity of variance is met when Correct
Answer-Variances in different groups are approximately equal
,Sum of the values of a data set divided by the number of values Correct
Answer-Mean
The middle value of a data set when the values are arranged in
increasing (or decreasing )order Correct Answer-Mode
When the number representing a variable has infinite possible values on
a scale (e.g. height) it is best described as___data Correct Answer-
continuous
When calculating statistical power and sample size estimation we need
to estimate the strength of the statistical procedure. To determine the
statistical power which variable (s) are needed to determine the sample
size for an a priori power analysis? Correct Answer-Power
Effect size
Significance level
A researcher is interested in Determining whether exercise can curb
appetite for adult living with obesity. To address the hypothesis, the
researcher randomly assigns the adults to either an exercise group or a
control group (no exercise). The researcher then asks each participant
how hungry they are before and after receiving the exercise intervention
or control . In this design, ___________ is the independent groups
independent variable, ___________ is the repeated measures
independent variable, and _________is the dependent variable. Correct
Answer-1. Group(exercise, control)
2. Time Point (pre, post)
,3. Appetite
According to the law of large numbers, which of the following is true?
Correct Answer-As the sample size increases, the relative frequencies of
outcomes get closer to the theoretical or actual probability value
What is the difference between variance, standard deviation and error?
Correct Answer-Variance is the average variability of scores about the
mean in squared units
Standard deviation is the average variability of scores about the mean in
original units
Standard error is the average variability of scores from a sample
compared to other samples in the population
To determine if there is a difference in average blood pressure between
men and women, the appropriate statistical analysis would
be____________statistics. Correct Answer-Differential (experimental )
Correct Answer-
Please order the steps of scientific research Correct Answer-1.
Encounter a problem or research question
2. Make Prediction and define measures
3. Think through the consequences of the predictions and choose of
measures
, 4. Design and run the study, collect data compute statistics and make
decisions about whether the results support the predictions
5. Draw conclusion, identify limitations, think ahead to the next step in
studying the topic
A researcher is interested in determining whether exercise can curb
appetite for adults living with obesity. To address the hypothesis, the
researcher randomly assigns the adults to Correct Answer-
The difference between the sample value and the actual population value
from normal fluctuations in sampling variation is known as _____error
Correct Answer-Sampling
Examples of interval data Correct Answer-Degrees Celsius , time, credit
score, SAT score, pH
Ratio Examples Correct Answer-heights, lengths, distances, volumes
calories consumed
Physical activity minutes per week
blood glucose, blood pressure,
Financial income
Income, weight, annual sales, market share, product defect rates, time to
repurchase, unemployment rate, and crime rate
pulse rate, respiratory rate, body temperature (°K), and body length in
infants or height in adults.pulse rate, respiratory rate, body temperature
(°K), and body length in infants or height in adults.
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