Educator wants to know if there is a differencee between summer/fall classes. Two samples of 60 students each, what would the null and alternative hypothesis be to see if there is a difference in the means of both student samples (summer/fall).??
Where,
Population mean for summer classes
Population mean for fall classes
Educator wants to know if there is a differencee between summer/fall classes. Two samples of 60...
A teacher wants to compare scores on a geology exam for two classes. The difference between the sample means is 21.4. If the standard deviation of the distribution of the difference between sample means is 16.66, and she is testing the hypothesis at the 68% confidence level, which statement is true? A. The difference between the two means is significant, so the null hypothesis must be accepted. B. The difference between the two means is not significant, so the alternative...
A student wants to determine if there is a difference in the pricing between two stores for health and beauty supplies. She recorded prices from both stores for each of 10 different products. Assuming that the conditions for conducting the test are satisfied, determine if there is a price difference between the two stores. Use the 0.1 level of significance. Complete parts (a) through (d) below. A 5.94 B 7.48 C 3.75 D 1.72 E 1.77 F 2.81 G H...
16. A student wants to determine if there is a difference in the pricing between two stores for health and beauty supplies. She recorded prices from both stores for each of 10 different products. Assuming that the conditions for conducting the test are satisfied, determine if there is a price difference between the two stores. Use the a=0.005 level of significance Complete parts (a) through (d) below. A B с D E F G H 5.99 7.41 3.77 1.78 1.72...
In order to compare the means of two populations, independent random samples of 400 observations are selected from each population, with the results found in the table to the right. Complete parts a through e below. Sample 1 overbar x = 5,305 s1= 154 Sample 2 overbar x = 5,266 s2 = 199 a. Use a 95% confidence interval to estimate the difference between the population means (mu 1 - mu 2). Interpret the confidence interval. The confidence interval is...
Given two dependent random samples with the following results: Population 1 70 60 72 55 69 50 55 74 Population 2 72 56 81 50 79 60 50 78 Can it be concluded, from this data, that there is a significant difference between the two population means? Let d=(Population 1 entry)−(Population 2 entry). Use a significance level of α=0.1for the test. Assume that both populations are normally distributed. State the null and alternative hypotheses Find the value of the standard...
A telephone company wants to determine whether the appeal of a new security system varies between homeowners and renters. Independent samples of 140 homeowners and 60 renters are randomly selected. Each respondent views a TV pilot in which a test ad for the new security system is embedded twice. Afterward, each respondent is interviewed to find out whether he or she would purchase the security system. What type of hypothesis test is appropriate for this scenario? Z-test for the difference...
Problem Set 7.1: t Test with Related Samples • Criterion: Differentiate between independent samples, repeated measures, and matched samples. • Data: o Scenario A: A researcher wants to know whether men or women spend more money at the movie concession stand. He asks the concession clerk to identify customers as male or female by marking their gender on each saved receipt. o Scenario B: A CPR instructor wants to know if her students are learning anything during her 90-minute training....
in order to compare the means of two populations, independent random samples of 400 observations are selected from each population with the results: sample 1: x1= 5275 and s1= 150 sample 2: x2= 5240 and s2 = 200 a. use a 95% confidence interval to estimate the difference between the population means (m1-m2) interpret the difference. b. test the null hypothesis (m1-m2 = 0) versus the alternative (m1-m2 isn't = to 0). give the p-value of the test and interpret...
You are given two independent random samples from two populations. For Sample #1, there are 60 observations, the sample mean is 33.8 and you are given that the populationstandard deviation is 5.5 For Sample #2, there are 35 observations, the sample mean is 31.8 and you are given that the populationstandard deviation is 4.1 You are asked to test the null hypothesis that the two population have the same mean (the difference in population means is 0). What is the...
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A developer wants to know if the houses in two different neighborhoods were built at roughly the same time. She takes a random sample of six houses from each neighborhood and finds their ages from local records. The accompanying table shows the data for each sample (in years). Assume that the data come from a distribution that is Normally distributed. Complete parts a through c below EB Click the icon to view the data table a) Test the...