# Quantitative data questions and answers Recent questions in Describing quantitative data
Describing quantitative data
ANSWERED ### In Major League baseball, do Left-Handed hitters and Right-Handed hitters tend to have different batting averages? We will study this question by taking random samples of m=45 seasonal batting averages from left-handed batters and n=53 seasonal batting averages from right-handed batters. The mean batting averages were x= .256 for the left-handers and y=.254 for the right-handers. It is recognized that the true standard deviations of batting averages are σx = .0324 for left-handed batters and σy = .0298 for right-handed batters. The true (unknown) mean batting average for left-handers = μx , while the true unknown mean batting average for right-handers = μy . We would like to examine μx − μy . a) What is the standard deviation of the distribution of x? b) What is the standard deviation of the distribution of x - y ? c) Create a 98% confidence interval for μx − μy ? leftparen1.gif , rightparen1.gif d) What is the length of the confidence interval in part c) ?

Describing quantitative data
ANSWERED ### What is the difference between quantitative and qualitative data.

Describing quantitative data
ANSWERED ### What is the relationship between a frequency or relativefrequency distribution of a quantitative data set and that of a qualitative data set?

Describing quantitative data
ANSWERED ### To determine:Name the variables, specify for each variable whether it should be treated as categorical or quantitative and give the units for quantitative variables, if available.

Describing quantitative data
ANSWERED ### An article in Chance magazine reported on the Houston Independent School District's magnet schools programs. Of the 1755 qualified applicants, 931 were accepted, 300 were wait-listed, and 524 were turned away for lack of space. Find the relative freuqency distribution of the decisions made and write a sentence describing it.

Describing quantitative data
ANSWERED ### After receiving many complaints about his final-grade histogram from students currently taking a Statistics course, the professor distributed the following revised histogram. a) Comment on this display. b) Describe the distribution of grades.

Describing quantitative data
ANSWERED ### Discuss the differences between quantitative and qualitative data, as well as the advantages and disadvantages of each. As a part of your response, describe one type of quantitative data.

Describing quantitative data
ANSWERED ### A group of students at a high school took a students who passed or faidel the exam is bro... following table. Determine whether gender ar... in dependent by filling out the bla in the se... probabilities to the nearest thousandth. Passed Failed Male 9 21 Female 48 2

Describing quantitative data
ANSWERED ### What is distinguish between qualitative and quantitative data?

Describing quantitative data
ANSWERED ### Why do senior executives feel more comfortable relying on quantitative data than qualitative data? How might a qualitative research company lessen the senior-level executive’s skepticism?

Describing quantitative data
ANSWERED ### The difference between the qualitative and quantitative data with examples

Describing quantitative data
ANSWERED ### Which type of statistical information or graph would be most helpful in determining whether the baseline characteristics of a study group are well balanced? A) A bar chart B) Descriptive statistic C) A box-whisker plot D) A flow chart

Describing quantitative data
ANSWERED ### Identify the population: An education professor wants to gather information about parental involvement in early education for students attending a particular Ivy League university. She obtains a list of registered students from the registrar's office and randomly chooses 300 students to study.

Describing quantitative data
ANSWERED ### Consider the following research questions/study scenarios. For each study, discuss the most appropriate methods for describing the data (graphically and numerically). What statistical method would be most appropriate for addressing the research questions? Be sure to provide justification of the statistical method. Provide the appropriate regression model and statistical test when appropriate. 1.A study was performed to determine the differences in pain experienced by children with sickle cell disease (SCD) in inpatient and outpatient settings. Pain intensity (visual analog scale) was the primary outcome of interest, but potential confounders include age and physical activity.

Describing quantitative data
ANSWERED ### In an exit poll during the 2004 presidential election, voters were asked to name the issue that most affected their vote for a candidate for presidency. The following table summarizes their responses. Moral Values: 22% Economy/jobs: 20% Terrorism: 19% Iraq: 15% Health Care: 8% Taxes: 5% Education: 4% As you will notice, these percentages add up to 93%. Assume that the remaining 7% of these voters names other issues and let us denote these issues as Other. Draw a bar graph to display these data.

Describing quantitative data
ANSWERED ### Explain how to find the range of a data set. 1)What is an advantage of using the range as a measure of variation? 2)What is a disadvantage?

Describing quantitative data
ANSWERED ### True or False 1.The goal of descriptive statistics is to simplify, summarize, and organize data. 2.A summary value, usually numerical, that describes a sample is called a parameter. 3.A researcher records the average age for a group of 25 preschool children selected to participate in a research study. The average age is an example of a statistic. 4.The median is the most commonly used measure of central tendency. 5.The mode is the best way to measure central tendency for data from a nominal scale of measurement. 6.A distribution of scores and a mean of 55 and a standard deviation of 4. The variance for this distribution is 16. 7.In a distribution with a mean of M = 36 and a standard deviation of SD = 8, a score of 40 would be considered an extreme value. 8.In a distribution with a mean of M = 76 and a standard deviation of SD = 7, a score of 91 would be considered an extreme value. 9.A negative correlation means that as the X values decrease, the Y values also tend to decrease. 10.The goal of a hypothesis test is to demonstrate that the patterns observed in the sample data represent real patterns in the population and are not simply due to chance or sampling error.

Describing quantitative data
ANSWERED ### Data that can be sorted into distinct groups is called quantitative 1. True 2.False

Describing quantitative data
ANSWERED ### Determine whether the data described below is quantitative of qualitative variable. A. The data are quantitative because they don't count nor measure anything. B. The data are quantitative because they consist of counts or measurements. C. The data are qualitative because they don't count nor measure anything. D. The data are qualitative because they consist of counts or measurements.

Describing quantitative data
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