# Research Question - Expert Answers

2. Developing a Research Question

Business Question: New mothers are asking their doctor if the baby weight gained after birth using formula brand A is different than with brand B. A research study is to be set up. Choose the best research question. Hint: Use the Research Question handout.

RQ: Is there a difference in average baby weight gain based on the formula brand?

RQ: Is there a relationship in the average baby weight gain based on the formula brand?

RQ: Is there a correlation in the average baby weight gain based on the formula brand?

RQ: Are the new moms concerned about the baby weight gained using a particular formula brand?

3. Writing Hypothesis Statements

Select the best hypothesis statements for this RQ: Is there a difference in average weekly salary based on occupation (nurses, schoolteachers)?

A. Ho: μ1 = µ2
There is no difference in average weekly salary based on occupation (nurses, schoolteachers).
H1: µ2 ≠ µ2
There is a difference in average weekly salary based on occupation (nurses, schoolteachers).

B. Ho: μ1 ≠ µ2
There is a difference in average weekly salary based on occupation (nurses, schoolteachers).
H1: µ2 = µ2
There is no difference in average weekly salary based on occupation (nurses, schoolteachers).

C. Ho: μ1 = µ2
There is no difference in average weekly salary based on occupation (nurses, schoolteachers).
H1: µ2 µ2
There is greater average weekly salary based on occupation (nurses, schoolteachers).

5. Types of Data

What type of variable is the number of gallons of gasoline pumped by a filling station during a day?

Attribute - Ordinal

Numeric - Ratio - Continuous

Attribute - Nominal

Numeric - Ratio - Discrete

6. Levels of Measurement

The final rankings of the top 20 NCAA college basketball teams are an example of which level of measurement?

Interval

Ratio

Ordinal

Nominal

7. Literature Review Sources

What document sources would be used during an academic literature review? (choose one or more)

Peer-reviewed or Scholarly articles

Newspapers

Articles by authors who write on a variety of topics.

Professional blogs by vetted authors

9. APA Benefits

APA (American Psychological Association) format is required documentation styles at the University of Phoenix. This format is traditionally used when writing research papers. What are the benefits? (choose one or more)

Guards against plagiarism

Supports the author’s credibility

Provides a common writing style

10. Random Sampling Methods

Identify the four random sampling methods discussed in class. (choose one or more)

Cluster

Systematic

Snowball

Simple

Stratified

11. Sample Size

What is the minimum sample size needed for registered voters in California, USA? (choose one or more)

95% confidence level, 5% margin of error
California: n = 385 samples
USA: n = 385 samples

95% confidence level, 3% margin of error
California: n = 1068 samples
USA: n = 1068 samples

95% confidence level, 5% margin of error
California & USA: n = 5% of the registered voters

13. Descriptive Statistics Central Tendency Measures
What central tendency measure you would use when data was (a) normal; (b) significantly skewed?

a. Mean
b. Median

a. Median
b. Mean

a. Standard deviation
b. Interquartile range (IQR)

Always, the mean = median = mode

14. Descriptive Statistics Dispersion Measures

What dispersion measure you would use when data was (a) normal; (b) significantly skewed?

a. Interquartile range (IQR)
b. Standard deviation

a. Standard deviation
b. Interquartile range (IQR)

a. Mean
b. Median

Always, the standard deviation = interquartile range = range

15. Descriptive statistics Dog Weight
count 25
mean 100.4
sample standard deviation 5.2
minimum 89
maximum 108.9
range 19.9

confidence interval 95.% lower 98.3
confidence interval 95.% upper 102.5
t(df = 24) 2.1

1st quartile 98.3
median 101.0
3rd quartile 103.8
interquartile range 5.5
mode #N/A

normal curve GOF
p-value . 17
Descriptive Statistics Interpretation
Craft an interpretation, in layman terms, of the above data using a minimum of five statistical measures. Note: Use Average but other statistical terms need to be in layman language.