Comparing two groups Mastery: Pro Tips & Tricks

Recent questions in Comparing two groups

Jaden Easton 2021-10-12

Define degrees of freedom in the context of t-tests.
The t test is used to check if the averages of two groups are statistically different from each other or not. Moreover, the significant difference between the two groups can be analysed using t test. It is used the sample size is small and population variances are unknown and the populations are normally distributed.

boitshupoO 2021-10-12

a) Explain whether it is possible to use inferential methods for independent samples.
b) Explain whether there is enough information to compare the proportions using dependent samples or not.

FizeauV 2021-10-12

A teacher sees students straggling into her class at highly diverse times. She secretly records when each person comes into her class. Everyone in the class at the bell gets a score of zero. Then, as each late person comes in, the number of seconds after the bell that the person arrives is recorded. Number of seconds late, then, is each person's individual score. The scores ranged from 0 to 600 (for people who were 10 minutes late). The teacher also has each person's exam average over the semester. She wants some estimate of the degree of relationship between a person's lateness and his or her exam scores in her class. Which statistic should she use?
a. Z-test
b. One Sample t-test
c. Independent groups t-test
d. Dependent groups t-test
e. One Factor ANOVA
f. Two factor ANOVA
g. t-test for $r > 0$
h. Chi-square test
i. Phi Coefficient
j. Cramer’s Phi
k.Point Biserial r
L. Eta-squared
m. r-squared or r

Brennan Flores 2021-10-12

Why is Sampling, Estimation and Testing Important?

Jason Farmer 2021-10-12

Determine the appropriate test for the following situations:
a. To test whether there is an association between type of apartment and monthly rent.
b. To test whether the mean income of paramedics is same for male and female paramedics.

illusiia 2021-10-11

What is an advantage of using a stem-and-leaf plot instead of a histogram? What is a disadvantage?

Carol Gates 2021-10-11

a) Explain the reasons for the data set not being paired.
b) Determine the sample with larger mean and explain how it is determined.
c) Test whether the population mean birth weight is greater for mothers who do not smoke using a significance level of 0.05.

Phoebe 2021-10-10

Identify the TEST for the below scenario and explain why you will choose the test for the analysis:
You are interested to understand the yearly patients visit to a dentist in a given dental practice. There are total 500 patients visiting the dentist yearly and they are enrolled in either Insurance A or Insurance B. Which test will you use to understand the patients visit to the dentist? Assume the data was not normally distributed.

Albarellak 2021-10-09

The t-test for dependent means should be used in which of the following scenarios?
You are comparing more than two groups that are related.
You are comparing more than two groups that are unrelated.
You are comparing exactly two groups that are unrelated.
You are comparing exactly two groups that are related.

Isa Trevino 2021-10-08

An instructor wants to find out whether modality of instruction affects students

Zoe Oneal 2021-10-08

please explain this two situation without making any calculations.
c. 200 autistic children were given an IQ test. The researcher wants to compare their average IQ to IQ of the general public. Which hypothesis test should they use and why? d. Do you prefer to have high Type I error or high Type II error in your hypothesis test? Why?

pedzenekO 2021-10-07

Find the nonparametric test that is an extension to the Wilcoxon test.

how many ways can 9 peoples be assigned to 2-triple, 1-double and 1-single room?

Ramsey 2021-08-12

Water flows through a water hose at a rate of $Q_{1} = 680 c \frac{m^{3}}{s}$ , the diameter of the hose is $d_{1} = 2.2 c m$ . A nozzle is attached to the water hose. The water leaves the nozzle at a velocity of $v_{2} = 9.2 \frac{m}{s}$ .
1) Enter an expression for the cross-sectional area of the hose, $A_{1}$ , in terms of its diameter, $d_{1}$
2) Calculate the numerical value of $A_{1},$ in square centimeters.
3) Enter an expression for the speed of the water in the hose, $v_{1}$ , in terms of the volume floe rate $Q_{1}$ and cross-sectional area $A_{1}$
4) Calculate the speed of the water in the hose, $v_{1}$ in meters per second.
5) Enter an expression for the cross-sectional area of the nozzle, $A_{2}$ , in terms of $v_{1}, v_{2}$ and $A_{1}$
6) Calculate the cross-sectional area of the nozzle, $A_{2}$ in square centimeters.

e1s2kat26 2021-06-10

Water flows through a water hose at a rate of $Q_{1} = 680 c m^{3} / s$ , the diameter of the hose is $d_{1} = 2.2 c m$ . A nozzle is attached to the water hose. The water leaves the nozzle at a velocity of $v_{2} = 9.2 m / s$ .
a) Enter an expression for the cross-sectional area of the hose, $A_{1}$ , in terms of its diameter, $d_{1}$
b) Calculate the numerical value of $A_{1},$ in square centimeters.
c) Enter an expression for the speed of the water in the hose, $v_{1}$ , in terms of the volume floe rate $Q_{1}$ and cross-sectional area $A_{1}$
d) Calculate the speed of the water in the hose, $v_{1}$ in meters per second.
e) Enter an expression for the cross-sectional area of the nozzle, $A_{2}$ , in terms of $v_{1}, v_{2}$ and $A_{1}$
f) Calculate the cross-sectional area of the nozzle, $A_{2}$ in square centimeters.

Kyran Hudson 2021-03-12

The mean + 1 sd of In [calcium intake (mg)] among 25 females, 12 to 14 years of age, below the poverty level is $6.56 + 0.64 .$
Similarly, the mean + 1 sd of In [calcium intake (mg)] among 40 females, 12 to 14 years of age, above the poverty level is $6.80 + 0.76 .$
8.2 Test for a significant difference between the variances of the two groups.
8.3 What is the appropriate procedure to test for a signifi- cant difference in means between the two groups?
8.4 Implement the procedure in Problem 8.3 using the critical-value method.
8.5 What is the p-value corresponding to your answer to Problem 8.4?
8.6 Compute a $95 %$ Cl for the difference in means between the two groups.

Emeli Hagan 2021-03-09

Decide equation using only factors to solve this problem
$12 x^{2} + 5 x - 2 = 0$

pancha3 2021-03-08

Describe a possible application of hypothesis testing to a business setting. The application you describe need not be a real one (one that has actually occurred), it can be an application that you invent. You should describe a) what the business setting is b) what data you would use c) what null hypothesis you would test and what the alternative hypothesis is. d) what type of test you would use e) You should explain what level of significance you would use and why. f) You should explain how to interpret the outcome of the test: what does it tell you if you could reject or could not reject the null hypothesis? g) Finally, you should explain the possible advantages of using hypothesis testing in this application and its possible downsides dangers (when how using a hypothesis test could lead to mistaken inferences or erroneous decisions).

opatovaL 2021-03-07

Population The resident population P (in millions) of the United States from 2000 through 2013 can be modeled by $P = - 0.00232 t^{3} + 0.0151 y^{2} + 2.83 t + 281.8, 0 \leq t \leq 13,$ where $t = 0$ corresponds to 2000.
(Source: U.S. Census Bureau)
Make a conjecture about the maximum and minimum populations of the United States from 2000 to 2013.
Analytically find the maximum and minimum populations over the interval.
The brief paragrah while comparing a conjecture with the minimum population was 281.8 million in 2000 and the maximum population was 316.1 million in 2013.
We need to calculate: The absolute extrema of the popullation $P = - 0.00232 t^{3} + 0.0151 y^{2} + 2.83 t + 281.8, 0 \leq t \leq 13$ over the closed interval [0, 13].

Yasmin 2021-03-06

Give a full answer to given question

1) An independent-measures study uses ?

2) An independent-measures study uses two samples, each with $n = 13$ , to compare two treatment conditions. What is the df value for the t statistic for this study?

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.

Learn Comparing two groups with Plainmath's Expert Help and Detailed Explanations