Question 1

Using linear regression,you compare two different methods for quantifying LDL in a serum sample.Which of the following is NOT acceptable practice when using regression lines?

Accepted Answer

A)   Calculation of the slope of the best fit line through the data points
B)   Extrapolation of points outside the standard curve
C)   Identification of the y-intercept using the slope of the standard curve
D)   Interpolation of points within the range of the standard curve B

Question 2

The central tendency of a numerical data set refers to

Accepted Answer

A)   accuracy.
B)   the pattern created by the data when plotted on a logarithmic scale.
C)   the precision of the equipment from which the data were obtained.
D)   the value that typifies the data. D

Question 3

You are provided the following set of data: 20,21,28,42,43,43,50 Which value represents the median of this data set?

Accepted Answer

A)   20
B)   36
C)   42
D)   43 C

Question 4

A manufacturer-supplied sample of serum glucose is known to contain 85 mg/dL.A co-worker runs a test of the sample on a new piece of laboratory equipment and determines it to be 84 mg/dL.What can be inferred about the new laboratory equipment?

Accepted Answer

A)   It is accurate.
B)   It has no standard deviation.
C)   It is precise.
D)   Both A and C are correct.

Question 5

Why is it necessary for a clinical laboratory professional to develop a strong understanding of statistics?

Accepted Answer

A)   To comprehend data published in research papers and prepare data for possible publication
B)   To determine whether laboratory equipment is functioning properly
C)   To understand manufacturer instructions for testing methods and laboratory equipment
D)   All of the above

Question 6

A laboratory technician measures the concentration of serum glucose in a sample ten times and obtains the following results: 32,84,84,86,87,87,87,88,89,89
Which of the following is most impacted by the presence of the outlier value?

Accepted Answer

A)   Mean
B)   Median
C)   Mode
D)   Both A and B are correct.

Question 7

What does the mode of a data set represent?

Accepted Answer

A)   The average of the value of all the data
B)   The inverse of the mean calculated from all the values
C)   The median value of the data set
D)   The value that occurs most frequently

Question 8

What is a major disadvantage of just reporting the mean,median,and mode of a data set?

Accepted Answer

A)   All these values are subjective and open to interpretation by the person making the calculations.
B)   None of these values tell how widely dispersed the data are around it.
C)   The information provided by the mean, median, and mode are not related to each other.
D)   The values do not indicate why the data were collected.

Question 9

The correlation coefficient of two variables is r = 0.5.What is the coefficient of determination for these variables?

Accepted Answer

A)   -0.10
B)   -0.25
C)   0.10
D)   0.25

Question 10

How does one calculate the mean of a data set?

Accepted Answer

A)   Add all the values together and divide the sum by the number of values.
B)   Add the largest and smallest value and divide the sum by 2.
C)   Add the two largest values and divide the sum by the number of values.
D)   Add the two middle values and divide the sum by 2.

Question 11

The standard deviation of a data set can be calculated from the following equation. s =
$\sqrt{\frac{\sum_{i=1}^{n}\left(x_{i}-x\right)^{2}}{n-1}}$
What does the value under the sigma (i = 1)represent?

Accepted Answer

A)   The value of the final data point
B)   The value of the first data point
C)   The value of the mean
D)   The value of the mode

Question 12

If an experiment produces a result having a p value less than 0.05,what is the probability that any differences found would have been observed even if the null hypothesis is true?

Accepted Answer

A)   Less than 1 chance in 10
B)   Less than 1 chance in 20
C)   Less than 1 chance in 100
D)   Less than 1 chance in 200

Question 13

When linear regression fails to fit a straight line to the data,what method can be applied to determine the relationship between two variables?

Accepted Answer

A)   Coefficient determination
B)   Expansion of the sum
C)   Nonlinear regression
D)   Specimen pairing

Question 14

A colleague generates a best-fit line through a set of data points and asks you to confirm its usefulness and goodness-of-fit.You perform a root-mean-squared-error (RMSE)calculation and come up with a very small RMSE value.Based on this value you determine that the best-fit line

Accepted Answer

A)   deviates far from the data points.
B)   fits the data well.
C)   is useless for interpolation but valid for extrapolation.
D)   predicts a value that is too far from the actual value.

Question 15

Which of the following sets of data would be bimodal?

Accepted Answer

A)   2, 2, 5, 6, 9, 9, 10, 12, 15, 17, 19
B)   2, 4, 6, 8, 10, 12, 14, 16, 18
C)   3, 3, 3, 4, 5, 6, 7, 9, 11, 14, 14
D)   3, 3, 4, 5, 6, 7, 9, 11, 11, 14, 17

Question 16

Which of the following statements regarding significance tests is true?

Accepted Answer

A)   Nonrejection of the null hypothesis does not mean it is true.
B)   Significance thresholds are fixed and logical.
C)   Statistical significance is equal to practical significance.
D)   The p value is fixed and obvious.

Question 17

The coefficient of determination is

Accepted Answer

A)   the ratio of the explained variation to the total deviation.
B)   the ratio of the explained variation to the total variation.
C)   the ratio of the unexplained deviation to the explained deviation.
D)   the ratio of the unexplained deviation to the total variation.

Exam 8: Statistics

Using linear regression,you compare two different methods for quantifying LDL in a serum sample.Which of the following is NOT acceptable practice when using regression lines?

The central tendency of a numerical data set refers to

You are provided the following set of data: 20,21,28,42,43,43,50 Which value represents the median of this data set?

A manufacturer-supplied sample of serum glucose is known to contain 85 mg/dL.A co-worker runs a test of the sample on a new piece of laboratory equipment and determines it to be 84 mg/dL.What can be inferred about the new laboratory equipment?

Why is it necessary for a clinical laboratory professional to develop a strong understanding of statistics?

A laboratory technician measures the concentration of serum glucose in a sample ten times and obtains the following results: 32,84,84,86,87,87,87,88,89,89 Which of the following is most impacted by the presence of the outlier value?

What does the mode of a data set represent?

What is a major disadvantage of just reporting the mean,median,and mode of a data set?

The correlation coefficient of two variables is r = 0.5.What is the coefficient of determination for these variables?

How does one calculate the mean of a data set?

The standard deviation of a data set can be calculated from the following equation. s = $\sqrt{\frac{\sum_{i=1}^{n}\left(x_{i}-x\right) ^{2}}{n-1}}$ What does the value under the sigma (i = 1) represent?

If an experiment produces a result having a p value less than 0.05,what is the probability that any differences found would have been observed even if the null hypothesis is true?

When linear regression fails to fit a straight line to the data,what method can be applied to determine the relationship between two variables?

A colleague generates a best-fit line through a set of data points and asks you to confirm its usefulness and goodness-of-fit.You perform a root-mean-squared-error (RMSE) calculation and come up with a very small RMSE value.Based on this value you determine that the best-fit line

Which of the following sets of data would be bimodal?

Which of the following statements regarding significance tests is true?

The coefficient of determination is

Exam 8: Statistics

Using linear regression,you compare two different methods for quantifying LDL in a serum sample.Which of the following is NOT acceptable practice when using regression lines?

The central tendency of a numerical data set refers to

You are provided the following set of data: 20,21,28,42,43,43,50 Which value represents the median of this data set?

A manufacturer-supplied sample of serum glucose is known to contain 85 mg/dL.A co-worker runs a test of the sample on a new piece of laboratory equipment and determines it to be 84 mg/dL.What can be inferred about the new laboratory equipment?

Why is it necessary for a clinical laboratory professional to develop a strong understanding of statistics?

A laboratory technician measures the concentration of serum glucose in a sample ten times and obtains the following results: 32,84,84,86,87,87,87,88,89,89 Which of the following is most impacted by the presence of the outlier value?

What does the mode of a data set represent?

What is a major disadvantage of just reporting the mean,median,and mode of a data set?

The correlation coefficient of two variables is r = 0.5.What is the coefficient of determination for these variables?

How does one calculate the mean of a data set?

The standard deviation of a data set can be calculated from the following equation. s = ∑i=1n(xi−x) 2n−1\sqrt{\frac{\sum_{i=1}^{n}\left(x_{i}-x\right) ^{2}}{n-1}}n−1∑i=1n​(xi​−x) 2​​ What does the value under the sigma (i = 1) represent?

If an experiment produces a result having a p value less than 0.05,what is the probability that any differences found would have been observed even if the null hypothesis is true?

When linear regression fails to fit a straight line to the data,what method can be applied to determine the relationship between two variables?

A colleague generates a best-fit line through a set of data points and asks you to confirm its usefulness and goodness-of-fit.You perform a root-mean-squared-error (RMSE) calculation and come up with a very small RMSE value.Based on this value you determine that the best-fit line

Which of the following sets of data would be bimodal?

Which of the following statements regarding significance tests is true?

The coefficient of determination is

The standard deviation of a data set can be calculated from the following equation. s = $\sqrt{\frac{\sum_{i=1}^{n}\left(x_{i}-x\right) ^{2}}{n-1}}$ What does the value under the sigma (i = 1) represent?