Study Design Types: Compare and Contrast Examples Approaches

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brittany shreve2022-06-16

listed below are the top 10 annual salaries (in millions of dollars) of tv personalities. fidnd the range,variance amdnthenstsndard deviation

B. Given the population 1, 2, 3, 4, 6, and 8. Suppose sample size of 3 are drawn from this
population.
4. What is the mean ( 𝜇 ) and the variance ( 𝜎
2
) of the population?
5. How many different sample size n = 3 can be drawn from this population? List them with
their corresponding means.
6. What is the mean ( 𝜇X̅ ) and the variance ( 𝜎
2
X̅ ) of the sampling distribution of the sample
mean?

nitraiddQ 2021-09-09

Choose the right answer for the question: "Regardless of individual seat-belt use, does living in a community with strict auto-safety laws affect individual risk of auto-related mortality?”
a) experimental study design
b) ecological study design
c) contextual or multi-level study design
d) case-control study design

Jason Farmer 2021-06-21

An observational study is retrospective if it considers only existing data. It is prospective if the study design calls for data to be collected as time goes on. Tell which of the following observational studies are retrospective and which are prospective. Paxton devises a complicated formula based on game statistics for rating quarterbacks. He applies it to all NFL quarterbacks who played in the league between 1950 and 2000 and concludes that the quarterbacks from the 1970s were the best overall.

Kyran Hudson 2021-05-18

An observational study is retrospective if it considers only existing data. It is prospective if the study design calls for data to be collected as time goes on. Tell which of the following observational studies are retrospective and which are prospective. A sample of moose in a national park are given ear tags so that naturalists can track their growth, movement, and physical condition during a ten-year study.

Ramsey 2021-03-11

To find:Whether the experiment is an observational or a designed experiment.

Tazmin Horton 2021-03-09

A proposed study design is to leave 100 questionnaires by the checkout line in a student cafeteria. The questionnaire can be picked up by any student and returned to the cashier. Explain why this volunteer sample is a poor study design.

Nannie Mack 2021-03-02

The Centers for Disease Control reported the percentage of people 18 years of age and older who smoke (CDC website, December 14, 2014). Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of 0.30. a. How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of 0.02? Use 95% confidence.

Armorikam 2021-03-02

In the 1970s a study was conducted in Philadelphia in which 500 cases were randomly assigned to treatments for the common cold: 250 subjects received the medication and 250 received a placebo. A total of 383 patients improved within 24 hours. Of those who received the medication 241 improved within 24 hours and of those who received the placebo 142 improved within 24 hours. A test of significance was conducted on the following hypotheses.
$H_{o}$ : The rates for the two treatments are equal.
$H_{a}$ : The treatment of medication has a higher improvement rate.
This test resulted in a p-value of 0.0761.
a.) Interpret what this p-value measures in the context of this study.
b.) Based on this p-value and study design, what conclusion should be drawn in the context of this study? Use a significance level of $α = 0.05$ .
c.) Based on your conclusion in part (b), which type of error, Type I or Type II, could have been made? What is one potential consequence of this error?

coexpennan 2021-02-24

A correlational study is designed to?
a) assess the association between two interval measures.
b) assess the association between two categorical variables
c) compare the means of three or more groups
d) manipulate the independent variables

Nann 2021-02-24

A study of young children was designed to increase their intake of whole-grain, rather than regular-grain, snacks. At the end of the study, the 79 children who participated in the study were presented with a choice between a regular-grain snack and a whole-grain alternative. The whole-grain alternative was chosen by 55 children. You want to examine the possibility that the children are equally likely to choose each type of snack.
$H_{0} : p = 0.5$
$H_{a} : p \neq 0.5$
Perform the significance test. (Use $α = 0.01$ . Round your test statistic to two decimal places and your P-value to four decimal places.)

Haven 2021-02-23

In the middle of the design, she decided to add the following line segment. How would she name this line segment?
_ or _

remolatg 2021-02-21

The Centers for Disease Control reported the percentage of people 18 years of age and older who smoke $⟨ C D C w e b s i t e, D e c e m b e r 14, 2014 ⟩$ . Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of 30.

a.) How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of .02(to the nearest whole number)? Use 95% confidence.

b.) Assume that the study uses your sample size recommendation in part(a) and finds 520 smokers. What is the point estimate of the proportion of smokers in the population(to 4 decimals)?

c.) What is the 95% confidence interval for the proportion of smokers in the population (to 4 decimals)?

Sinead Mcgee 2021-02-19

Is wrapping a banana in plastic wrap and leaving the other bananas alone to see which one rots faster and experimental study design or and observational study design?

permaneceerc 2021-02-18

To explain: whether the given study on male health professional is an observational study with a cohort design, an observational study with case-control design or an experiment

remolatg 2021-02-16

With the aid of examples briefly explain the difference between fixed effect and random effects models in experimental design.

jernplate8 2021-02-16

Participants enter a research study with unique characteristics that produce different scores from one person to another. For an independent-measures study, these individual differences can cause problems. Identify the problems and briefly explain how they are eliminated or reduced with a repeated-measures study. Independent-measures study is used in the study.

alesterp 2021-02-12

Whether the given study depicts an observational study or a designed experiment and to identify the response variable.
The study is conducted to compare the battery lives of a brand-name battery and a generic plain-label battery in digital cameras. For this purpose, 30 digital cameras are randomly selected and divided into 2 groups, one of the groups uses the brand-name battery while the other one uses the generic plain-label battery. In both the cameras, pictures are taken under identical conditions by keeping all variables, except the battery-type, in control.

Armorikam 2021-02-11

Whether the given study depicts an observational study or an experiment.
The study involved 250 large-mouth bass in a lake. The 250 large-mouth bass were netted by conservation agents and were observed to determine how many of them were carrying parasites.

When you are dealing with statistics and probability as a college student or need to solve some questions for your school class, the study design is an interesting concept to consider. The most important is to design and structure your statistical data. Start with the study design questions that must be answered by taking notes and explaining why you have taken a specific methodology. It will help you to narrow things down and avoid serving several statistical methods that can either make things simpler or even more complex. The study design example that you choose should serve as the template only as you should keep things unique! For example, when you need finding Y intercept

High school statistics

Quantitative and Qualitative Study Design Examples