How effective is the flu shot? In a control study, 82 of the 758 participants who received the placebo shot got the flu that season and 61 of the 990 participants who received the true flu shot got the flu that season. For this study, we should use t-interval for a population mean z-interval for a population proportion t-interval for the difference between two independent population means z-interval for the difference between two population proportions t-interval for the difference between two dependent population means Part 2 of 3 Come up with the 90% confidence interval for the difference. Round your answers to four decimal places and present your answers as proportions rather than percents.

Q: An experienced trader wants to find out whether there is a difference in the mean rate of return for…

A: Question 7: There are 15 types of trades. Let k=15 Between df=k-1=15-1=14 Between SS=297

Q: The systollc blood pressure (BP) of adults In the USA Is nearly normally distributed with a mean of…

A: Given Data Population Mean,μ = 121.0 Population Standard Deviation,σ = 15.0

Q: A researcher is analyzing data from a repeated-measures research study. If the researcher ran a…

A: The difference is, Subject 1st 2nd Difference #1 10 11 -1 #2 4 6 -2 #3 7 9 -2 #4 6 5 1…

Q: For the following examples, identify which studies involved independent samples or two related…

A: Dependent samples: The two samples are said to be dependent if there exist an effect of one on…

Q: A sample of n=8 scores has a mean of M=7. If one score is changed from X =20 to X =4, what is the…

A: Consider the first 7 scores is x1, x2, x3, x4, x5, x6, x7 and the 8th score is, x8=20. The formula…

Q: On average, Americans have lived in 2 places by the time they are 18 years old. Is this average less…

A: Sample size is greater than 30 and the population standard deviation is known. It is appropriate to…

Q: Let r be number of success from the n trials take from a population with proportion of success = P,…

A: Here given  r is no. of success n be the no of trials proportion of success p.

Q: You are conducting a study to determine if there is a significant difference between average adult…

A: Solution: State the hypotheses. Null hypothesis: That is, there is no significant difference…

Q: Question 4 options:   dividing a measure of within-groups variability by a measure of…

A: Formula : F ratio = MS_Between/MS_Within

Q: The average number of acres burned by forest and range fires in large new mexico country is 4,300…

A: According to the given information, we have Mean = 4300 Standard deviation = 750 The distribution is…

Q: The table below shows the observed pollution indexes of air samples in two areas of a city. Test the…

A: Null and alternative hypothesis: Given data represents the observed pollution indexes of air samples…

Q: 2. Monica is currently teaching basic mathematics at a university. She wants to know if there is a…

A:

Q: A researcher uses a repeated-measures study to compare two treatment conditions with a set of 20…

A:

Q: 1. Incide nce rate in the last influenza epidemic was found to be 50 per thousand (S%) of the…

A: Concept: for this question, we need to employ Cochran’s Sample Size Formula given by:…

Q: The sample data here is the cholesterol levels for 10 men diagnosed with high cholesterol. The first…

A: Solution:  Let μ1 represent the population  mean level for all men who do not the use drug.  μ2…

Q: D. Let us examine Mendel's F2 data for the round/wrinkled and yellow/green dihybrid cross. He…

A:

Q: Samuel Morse determined that the percentage of a's in the English language in the 1800s was 8%. A…

A: Denote p as the true proportion of a’s in modern newspaper. It is reported that proportion of a’s in…

Q: It is thought that a new process for producing a certain chemical may be cheaper than the currently…

A: Solution: The mean costs of the new method and old method are State the hypotheses. Null…

Q: When a population mean is compared to the mean of all possible sample means of size 25, the two…

A:

Q: ome up with the 90% confidence interval for the difference.

A: Given that  A researcher surveyed 677 college men and 587 college women.  498 of the college men…

Q: A psychologist examined the effect of chronic alcohol use/abuse on memory. In this experiment, a…

A: From the provided information,

Q: The EPA recommends avoiding consumption of fish species if the mercury concentration is higher than…

A: Obtain the confidence interval for the mercury concentration: The concentration in a large random…

Q: A researcher reports an F-ratio with df = 2, 40 from a repeated-measures ANOVA. How many treatment…

A: Option B (3) is correc answer   DFbetween experiments = K - 1 Given, DFbetween experiments = 2 K-1=2…

Q: a)​(c) For each of the accompanying​ scenarios, figure the estimated effect size​ (and whether it is…

A: Given the estimated effect size​ (and whether it is approximately​ small, medium, or large by​…

Q: A nutrition store in the mall is selling "Memory Booster," which is a concoction of herbs and…

A: Solution: Given information: n= 16 Sample size M= 24  Sample mean μ= 20  Population meanSS= 960 sum…

Q: 5. For this study, approximately how many of the children in the DM group had [ Select ] improvement…

A: Experimental design refers to how participants are allocated to the different groups in an…

Q: When results from a scholastic assessment test are sent to test-takers, the percentiles associated…

A: Given: 99th percentile  for their verbal grade

Q: The pH of rain, measured at a weather station in Michigan, was observed for 39 consecutive rain…

A: Given : n = 39 x¯ = 4.6982 s = 0.39623

Q: Between the two samples below, determine which one has the greater variability between groups,…

A: In order to determine whether there is significant difference in between the population means of…

Q: The population mean will always be the same as the mean of all possible X that can be computed from…

A: sample mean converges to population mean only when the sample size is large .

Q: The athletic director at a large university compared the proportions of freshmen (1st year students)…

A: The hypothesis is, Null hypothesis: H0: There is no difference between proportions of freshmen and…

Q: You are a data analyst for a large company, and you have received a dataset with a variety of…

A: Formula used: F statistic= Mean variation between         groups/mean variation within groups

Q: What conditions are necessary in order to use the dependent samples t​-test for the mean of the…

A: Necessary conditions for dependent samples in t-test, and for the difference in the means of two…

Q: Can pleasant aromas help a student learn better? Hirsch and Johnston, of the Smell & Taste Treatment…

A: Data are given, a) Here we used paired t-test because here we checking effects of wearing a…

Q: 1. Clearly indicate why a paired t-test should be used in this analysis. Then produce the…

A: 1. The paired t test is used when the subjects in the study are measured twice, that is the same…

Q: Let r be number of success from the n trials take from a population with proportion of success = p,…

A:

Q: By how many times does the sample size have to be increased to decrease the margin of error by a…

A: Margin of Error- In the theory of probability and statistics, there is a inverse relation between…

Q: To display the effects of the X variable on the Y variable in a bivariate table when the independent…

A: According to the provided information, the independent variable has been arranged in the columns.

Q: To check the effect of hot temperatures on the elasticity of two brands of rubber bands, one box of…

A: The given experiment is to check the average stretch of the hot bands in 2 different brands. Here,…

Q: Go through the steps of ANOVA hypothesis testing to see if you can conclude that there is a…

A: In order to determine whether there is significant difference in between the mean concentration of…

Q: Is there a significant relationship between income and the level of work adjustment of the…

A:

Q: The purpose of this activity is to compare the proportion of orange colored candy pieces between…

A: Let p1 = proportion of orange-colored candy pieces in the pack of skittles Let p2 = proportion of…

Q: 1. What is the difference between the t-statistic you calculate from your sample and teritical that…

A: We have given that the statement about t-statistic calculated from the sample and t-critical value…

Q: On a recent math test, the boys in Mr. Wadsworth's class seemed to have outscored the girls. The…

A:

Q: The claim is that the proportion of peas with yellow pods is equal to 0.25​ (or 25%). The sample…

A: Given that, x=117,n=450,p=0.25 The sample proportion is,

Q: A repeated-measures analysis of variance for a study comparing three treatment conditions with a…

A: Given information 3 treatments n = 20 participants F-ratio = 6.40 P-value = 0.0075(Using Excel = F.…

Q: Here is an ANOVA Table: Source SS d.f. MS F p-value Among groups 1000 4…

A: a)Number of groups  = df of among group+1                                  = 4 + 1 Number of groups…

Q: By how many times does the sample size have to be increased to decrease the margin of error by a…

A: Need to find By how many times does the Sample size have to be increased to decrease the margin of…

Ratios

A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.

Trigonometric Ratios

Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.