# Examples of Different Study Designs with Practice Questions

Recent questions in Study design
College StatisticsOpen question
vashikagreene 2022-06-17

## The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 60 and a standard deviation of 7. Using the empirical rule (as presented in the book), what is the approximate percentage of lightbulb replacement requests numbering between 53 and 60?Do not enter the percent symbol.ans =

Mike Jacob2022-06-07

## what statistic would you use if you had one independent variable, geographic location (north, south, east, west), and one dependent variable (satisfaction with the living environment, yes or no)?

erurnSopSoypegx 2021-11-23

## A researcher was interested in knowing whether the mean weight of the second baby is higher, lower, or about the same as the mean weight of the first baby for women who have at least two children

BolkowN 2021-10-25

## In a study designed to prepare new gasoline-resistant coatings, a polymer chemist dissolves 6.053 g of polyvinyl alcohol) in enough water to make 100.0 mL of solution. At ${25}^{\circ }C$, the osmotic pressure of this solution is 0.272 atm. What is the molar mass of the polymer sample?

nagasenaz 2021-10-11

## Which of the following types of studies require approval by an Internal Review Board? (Pick more than one) 1) Research that poses risks to participants 2) Surveys not meant to be published 3) Data collected for instructional purposes only 4) Data collected through phones or computers 5) Data collected on vulnerable populations

BenoguigoliB 2021-08-14

## The pathogen Phytophthora capsici causes bell pepper plants to wilt and die. A research project was designed to study the effect of soil water content and the spread of the disease in fields of bell peppers. It is thought that too much water helps spread the disease. The fields were divided into rows and quadrants. The soil water content (percent of water by volume of soil) was determined for each plot. An important first step in such a research project is to give a statistical description of the data. Soil Water Content for Bell Pepper Study $\begin{array}{ccccccccccccccc}15& 14& 14& 14& 3& 12& 11& 11& 11& 11& 10& 11& 13& 16& 10\\ 9& 15& 12& 9& 10& 7& 14& 13& 14& 8& 9& 8& 11& 13& 13\\ 15& 12& 9& 10& 9& 9& 16& 16& 12& 10& 11& 11& 12& 15& 8\\ 10& 10& 10& 11& 9\end{array}$ (a) Make a box-and-whisker plot of the data. Find the interquartile range.

coexpennan 2021-07-02

## Do piano lessons improve the spatial-temporal reasoning of preschool children? A study designed to investigate this question measured the spatial-temporal reasoning of a random sample of 34 preschool children before and after 6 months of piano lessons. The differences (After - Before) in the reasoning scores have mean 3.618 and standard deviation 3.055.

waigaK 2021-06-24

## What are the treatments for a designed study that utilizes one qualitative factor with four levels: A, B, C, and D?

glamrockqueen7 2021-06-24

## State whether the investigation in question is an observational study or a designed experiment. Justify your answer in each case. The National Association of Colleges and Employers (NACE) compiles information on salary offers to new college graduates and publishes the results in Salary Survey.

Rui Baldwin 2021-06-22

## A bank wants to know which of two incentive plans will most increase the use of its credit cards. It offers each incentive to a group of current credit card customers, determined at random, and compares the amount charged during the following six months. What type of study design is being used to produce data?

Dolly Robinson 2021-06-20

## Define the following terms: a. Observational study, b. Designed experiment.

Khaleesi Herbert 2021-06-18

## Who is more likely to binge drink—male or female college students? The Harvard School of Public Health surveys random samples of male and female undergraduates at four-year colleges and universities about whether they have engaged in binge drinking. What type of study design is being used to produce data?

postillan4 2021-06-16

## Refer to the Journal of Experimental Social Psychology (Vol. 45, 2009) study of whether buying gifts truly buys love. Recall that study participants were randomly assigned to play the role of gift giver or gift receiver. Gift receivers were asked to provide the level of appreciation (measured on a 7-point scale where 1 = "not at all" and 7 = "to a great extent") they had for the last birthday gift they received from a loved one. Gift givers were asked to recall the last birthday gift they gave to a loved one and to provide the level of appreciation the loved one had for the gift. The researchers wanted to know if the average level of appreciation is higher for birthday gift givers than for birthday gift receivers. a. Why is this study designed? b. Specify the key elements of the study: experimental unit, response variable, factor, and treatments.

permaneceerc 2021-06-15

## Determine whether the study is an observational study or an experiment. Explain. In a study designed to research the effect of music on driving habits, 1000 motorists ages 17- 25 years old were asked whether the music they listened to influenced their driving.

avissidep 2021-06-10

## Can filling car tires with nitrogen instead of compressed air increase gas mileage? Describe how you would design a study to try to answer this question. Be as specific as you can about the details of your study.

hexacordoK 2021-06-07

## The American Journal of Political Science (Apr. 2014) published a study on a woman's impact in mixed-gender deliberating groups. The researchers randomly assigned subjects to one of several 5-member decision-making groups. The groups' gender composition varied as follows: 0 females, 1 female, 2 females, 3 females, 4 females, or 5 females. Each group was the n randomly assigned to utilize one of two types of decision rules: unanimous or majority rule. Ten groups were created for each of the combinations of gender composition and decision rule. One variable of interest, measured for each group, was the number of words spoken by women on a certain topic per 1,000 total words spoken during the deliberations. a. Why is this experiment considered a designed study? b. Identify the experimental unit and dependent variable in this study. c. Identify the factors and treatments for this study.

illusiia 2021-06-01