Comparing two groups Mastery: Pro Tips & Tricks

Recent questions in Comparing two groups

Tyra 2021-02-03

Give full and correct answer for this question What are the two major inference procedures?

babeeb0oL 2021-02-02

Potential buyers for a new car were randomly divided into two groups. One group was shown the "A" version of an ad for the car, while the other group was shown the "B" version of the ad. All were then tested on their recall of key points made in the ad. The researcher should run a hypothesis test based upon a comparison of means for ?
In another study, a healthcare insurance company took measures of subscribers’ cardiac (heart) health. The people were then provided an app for their phones which provided "nudges" and reminders about heart-healthy behaviors, such as eating more vegetables and less fried or fatty food, taking walks and breaks from sitting too long, and getting enough sleep. After 4 months of having the app, the cardiac health measures were taken again, with the objective of seeing if nudges from the app would result in decreased cardiac risk. The researcher should run a hypothesis test based on a comparison of means for?

sanuluy 2021-02-01

As a vaccine scientist, you are required to test your newly developed vaccine in two different populations, populations Xand Y to ensure the safety and effectiveness of the vaccine. There are 3190 subjects from database X and 6094 subjects from database Therefore, you must select a number of subjects from populations X and Y to form a group. The newly formed of group must consist of subjects from both populations without repetition. The maximum number of groups which can be formed is denoted as d.
(1) Use Euclidean algorithm to find $d = G C D (X, Y) .$
2) Find the integers s and tsuch that $d = s X + t Y$
3) With the answer obtained from a, what is the ratio of subjects selected from population $X a n d Y, P X : P Y .$
4) Find Least Common Multiple for $X a n d Y, L C M (X, Y) .$

kuCAu 2021-02-01

Give a full and correct answer what is inference concerning the ration of two populations?

Globokim8 2021-01-31

Explain and give a full and correct answer how confusing the two (population and a sample) can lead to incorrect statistical inferences.

CMIIh 2021-01-31

Give full and correct answer for this questions Pooled variance is appropriately applied in which of the following scenarios? A)When comparing the mean of a treatment on a single group B)When comparing the mean of a treatment on two groups C)When comparing the means of three or more treatments on two groups D)When comparing the means of two treatments on three or more groups

FizeauV 2021-01-30

To compare two population means, $μ_{1}$ and $μ_{2}$ we use the information from the samples.

postillan4 2021-01-30

The standard deviation of daily iron intake in the larger population of 9-to 11-year-old boys was 5.56 mg. We want to test whether the standard deviation from the low-income group is comparable to that of the general population

pancha3 2021-01-30

To find: The probability of getting same number of men in two groups.
Given:
A group consists of 6 men and 6 women. Divide into groups 6 in each.

Brittney Lord 2021-01-28

Indicate true or false for the following statements. If false, specify what change will make the statement true.
a) In the two-sample t test, the number of degrees of freedom for the test statistic increases as sample sizes increase.
b) When the means of two independent samples are used to to compare two population means, we are dealing with dependent (paired) samples.
c) The $x^{2}$ distribution is used for making inferences about two population variances.
d) The standard normal (z) score may be used for inferences concerning population proportions.
e) The F distribution is symmetric and has a mean of 0.
f) The pooled variance estimate is used when comparing means of two populations using independent samples.
g) It is not necessary to have equal sample sizes for the paired t test.

Burhan Hopper 2021-01-27

Situations comparing two proportions are described. In each case, determine whether the situation involves comparing proportions for two groups or comparing two proportions from the same group (1 point each) a. Compare the proportion of U.S. adults who have a positive opinion about the media versus those who have a negative opinion about the media. A) Comparing proportions for two groups B) Comparing two proportions from the same group b. Compare the proportion of female students at a university who live in a dorm to the proportion of male students at a university who live in a dorm A) Comparing proportions for two groups B) Comparing two proportions from the same group

Lewis Harvey 2021-01-27

$\begin{array}{cc} H o u s e w o r k H o u r s \\ G e n d e r & S a m p l e S i z e & M e a n & S t a n d a r d D e v i a t i o n \\ W o m e n & 473473 & 33.133 .1 & 14.214 .2 \\ M e n & 488488 & 18.618 .6 & 15.715 .7 \end{array}$

a. Based on this study, calculate how many more hours per week, on the average, women spend on housework than men.

b. Find the standard error for comparing the means. What factor causes the standard error to be small compared to the sample standard deviations for the two groups? The cause the standard error to be small compared to the sample standard deviations for the two groups.

c. Calculate the 95% confidence interval comparing the population means for women Interpret the result including the relevance of 0 being within the interval or not. The 95% confidence interval for $(μ_{W} - μ_{M} )$ is: (Round to two decimal places as needed.) The values in the 95% confidence interval are less than 0, are greater than 0, include 0, which implies that the population mean for women could be the same as is less than is greater than the population mean for men.

d. State the assumptions upon which the interval in part c is based. Upon which assumptions below is the interval based? Select all that apply.

A.The standard deviations of the two populations are approximately equal.

B.The population distribution for each group is approximately normal.

C.The samples from the two groups are independent.

D.The samples from the two groups are random.

rocedwrp 2021-01-27

Prove an example of two independent samples and another example of dependent samples providing your reasoning To compare two means or two proportions, one works with two groups. The group are classfied either aas independent or matched pairs. Independent groups meam that the two samples taken are independent, that is, sample values selected from one population are not related in any way to sample values selected from the other population. Matched pairs consist of two samples that are dependent. The parameter tested using matched pairs is the population mean. The parameters tested using independent groups are either population means or population proportion.

nicekikah 2021-01-22

TWO GROUPS OR ONE? Situations comparing two proportions are described. In each case, determine whether the situation involves comparing proportions for two groups or comparing two proportions from the same group. State whether the methods of this section apply to the difference in proportions. (c) Compare the graduation rate (proportion to graduate) of students on an athletic scholarship to the graduation rate of students who are not on an athletic scholarship. This situation involves comparing: 1 group or 2 groups? Do the methods of this section apply to the difference in proportions? Yes or No

nicekikah 2021-01-19

Which of the following is not a condition for performing inference about a population mean U ? 1) Inference is based on n independent measurements. 2) The population distribution is Normal or the sample size is large (say n > 30). 3) The data are obtained from a SRS from the population of interest. 4) The population standard deviation, ?

generals336 2021-01-17

For this problem, assume that three students are chosen from 3 freshmen, 7 sophomores, and 5 juniors.
What is the probability of selecting 2 freshmen and 1 junior given that at least one freshman will be selected?

abondantQ 2021-01-10

The population P (in thousands) of Tallahassee, Florida, from 2000 through 2014 can be modeled by $P = 150.9 e^{k t},$ where t represents the year, with $t = 0$ corresponding to 2000. In 2005, the population of Tallahassee was about 163,075.
(a) Find the value of k. Is the population increasing or decreasing? Explain.
(b) Use the model to predict the populations of Tallahassee in 2020 and 2025. Are the results reasonable? Explain.
(c) According to the model, during what year will the — populates reach 200,000?

pancha3 2021-01-10

GIve a correct answer for this question: when we are comparing two population means from two groups (suppose they are called Group 1 and Group 2), which of the following statistics do we use to make a confidence interval or perform a hypothesis test for a difference in means?

Tyra 2021-01-10

Effect of alcoholic parents A study1 compared personality characteristics between 49 children of alcoholics and a control group of 49 children of nonalcoholics who were matched on age and gender. On a measure of well being, the 49 children of alcoholics had a mean of $26.1 (s = 7.2)$ and the 49 subjects in the control group had a mean of $[28.8 (s = 6.4)]$ . The difference scores between the matched subjects from the two groups had a mean of $2.7 (s = 9.7)$ .
a. Are the groups to be compared independent samples or depentend samples? Why?
b. Show all speps of a test equality of the two population means for a two-sided alternative hypotesis. Report the P-value and interpret.
c. What assumptions must you make the inference in part b to be valid?

amanf 2021-01-08

The table below provides predicted population data about the world and India.
a) What percent of the world population is predicted to live in India in 2035? Round your result to one decimal place.
b) What percent of the world population is predicted to live in India in 2050? Round your result to one decimal place.
c) Calculate the absolute change in the predicted population of India between 2035 and 2050. Round your result to the nearest whole number.

Comparing proportions between two groups examples is one of those popular tasks that students have to work with when they have two samples of statistical data that must be compared. As a rule, the questions like those you can see below are based on college-level statistical analysis, yet some tasks will require more. See our helpful answers and see what formulas and equations can be used to cut the corners as you achieve a suitable solution. These are only complex when you do have statistics examples that will guide you further.

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