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NUR 351: Modules 4.01 and 4.02
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Terms in this set (13)
Which measure of central tendency is the number that occurs most frequently in a distribution?
Mode
The highest score minus the lowest score in a distribution is known as the:
Range
Descriptive statistics are frequently used to answer research questions. True or False
FALSE
A correlation of −.80 is considered to be a:
Strong negative correlation
What is the median of the following set of numbers? 3 3 4 4 5 6 7 8 9
5
What indexes do descriptive statistics contain? (Select all that apply.)
Standard deviation
Central tendency
Frequency distributions
Variability of distribution
A systematic arrangement of values from lowest to highest, together with a count or percentage of how many times each value occurred, is:
frequency distribution
When considering the distributions of 4 data sets all having a mean of 100, identify the most homogeneous data set.
Range of 75-105
Which signifies the strongest inverse relationship?
r= −.64
A Type II error occurs when a false null hypothesis is rejected. True or False?
FALSE
A parametric test for testing the significance of differences in two group means is called a (an):
t Test
A nurse researcher is testing the effectiveness of an intervention to increase the amount of daily exercise in three groups of adolescents. He is interested in determining the mean group differences by comparing variability between groups to variability within groups. Which statistical test should the researcher use?
ANOVA
With a 95% confidence interval, researchers understand that the risk that they will be wrong is 95 times out of 100. True or False?
FALSE
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statistics
Two cards will be dealt off the top of a well-shuffled deck. You have a choice: (i) to win $1 if at least one of the two cards is queen. (ii) to win$1 if the first is a queen. Which option is better? Or are they equivalent? Explain.
statistics
In a certain chemical process, it is very important that a particular solution that is to be used as a reactant have a pH of exactly 8.20. A method for determining pH that is available for solutions of this type is known to give measurements that are normally distributed with a mean equal to the actual pH and with a standard deviation of .02. Suppose 10 independent measurements yielded the following pH values: $$ \begin{matrix} \text{8.18} & \text{8.17}\\ \text{8.16} & \text{8.15}\\ \text{8.17} & \text{8.21}\\ \text{8.22} & \text{8.16}\\ \text{8.19} & \text{8.18}\\ \end{matrix} $$ (a) What conclusion can be drawn at the $\alpha=.10$ level of significance? (b) What about at the $\alpha=.5$ level of significance?
statistics
Suppose the counts recorded by a Geiger counter follow a Poisson process with an average of three counts per minute. (a) What is the probability that there are no counts in a 30-second interval? (b) What is the probability that the first count occurs in less than 10 seconds? (c) What is the probability that the first count occurs between 1 and 2 minutes after start-up? (d) What is the mean time between counts? (e) What is the standard deviation of the time between counts? (f) Determine x, such that the probability that at least one count occurs before time x minutes is 0.95.
statistics
Suppose that A and B are two events. Write expressions involving unions, intersections, and complements that describe the following: At least one occurs.
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