Question 1:
To visualize a sample's frequency distribution, we can create a Histogram, which involves grouping observations into bins, counting the number of occurrences in each, and then charting the results.
True
False
Question 2:
The area under the curve between the mean value and a point 2 standard deviations away is identical for all normal distributions.
True
False
Question 3:
Using the Normal Distribution, approximately 2.5% of all observations fall below μ - 2σ.
True
False
Question 4:
The larger the sample size, the more likely x-bar will be close to μ.
True
False
Question 5:
In conducting hypothesis tests related to random samples, we often use Z-Scores to determine if we should reject the null hypothesis. The Z-Score can be thought of as the distance the sample statistic is from the hypothesized population parameter measured by the number of standard errors.
True
False
Question 6:
Which of the following is not a measure of dispersion?
variance
Expected Value
Range
Standard Deviation
The difference between the First and Third Quartiles values in the sample.
Question 7:
Which of the following is not expressed in the same measurement units as the data?
Mean
Expected Value
Median
Standard Deviation
Variance
Question 8:
Which statement is false?
The objective of a Hypothesis test is to prove the null hypotheses.
The mean of a distribution is also a weighted average.
Confidence intervals help us estimate 'true' population parameters
A histogram is a picture of the frequency distribution of a sample
Question 9:
In Excel, the function call: =NORM.DIST(10,505,1) will provide:
- The probability associated with values above 10 from a Normal Distribution with a mean of SO and a standard deviation of S.
- The probability associated with values below 10 from a Normal Distribution with a mean of SO and a standard deviation of S.
- The probability associated with values below 50 from a Normal Distribution with a mean of 10 and a standard deviation of S.
- The probability associated with values above 50 from a Normal Distribution with a mean of 10 and a standard deviation of S.
Question 10:
Each of the following mathematical symbols below will be used in the course. Which one of the symbols would normally be used to denote a statistic?