A random sample of 54 students from Cabrillo College are selected from a normal population with mu equal to 20 and sigma equal to 5. After a treatment is administered to the students, the researcher calculated the sample mean to be 21. Is there enough evidence to conclude that the treatment had an effect at the 5% significance level?  In step three, can we use the Critical Value Method? (a)Don't know (b)Cannot Determine (c)No

Q: If I have a sample of 25 people what is my T-threshold for a two-tail test and an alpha of 0.05…

A: Given: Sample size (n)=25 Level of significance α=0.05%

Q: In a clinical trial, 27 out of 875 patients taking a prescription drug daily complained of flulike…

A:

Q: In a one-sided hypothesis test for the mean, in a random sample of size 10 the t-score of the sample…

A:

Q: Curing diabetes: Vertical banded gastroplasty is a surgical procedure that reduces the volume of the…

A: Given :  Vertical banded gastroplasty is a surgical procedure that reduces the volume of the stomach…

Q: A sample of n=22 data values randomly collected from a normally distributed population has variance…

A: Solution-: Given: σ02=9.9,n=22,s2=17.9 Hypothesis: H0:σ2=σ02=9.9 Vs H1:σ2>9.9  (Right tailed…

Q: Using the textbook example of 420 California school districts and the regression of test scores on…

A: Given problem Given that   Using the textbook example of 420 California school districts and the…

Q: A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo. Participants…

A: Given Information: New Medication: Sample size n1=44+76=120 x1=44 Placebo: n2=21+99=120 x2=21…

Q: 8. A is the combination of one level from each factor. 9. In a 2x2 factorial ANOVA how many df do we…

A: Given three statements about factorial design models.

Q: If X1 is the mean of a random sample of size n from a normal population with the mean u and the…

A:

Q: Find the best critical region for testing H. :1 = 2 against H,:1 = 3 based on the sample drawn from…

A:

Q: As a researcher for the EPA, you have been asked to determine if the air quality in the United…

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and…

Q: A: Is this a one-tail or a two-tail test? B: What is the alpha level of this test? C: What is the…

A: Given that  Hypothesized Population Mean (\mu)(μ) = 7373 Population Standard Deviation…

Q: In a clinical trial, 20 out of 880 patients taking a prescription drug daily complained of flulike…

A: Given,n=880x=20H0:p=0.019H1:p>0.019Test statistic(z0)=0.80

Q: (b) If the researcher decides to test this hypothesis at the a = 0.05 level of significance,…

A: Here Given Sample size=n=19

Q: Imagine that your null hypothesis is μ = 16 and your alternative hypothesis is μ ≠ 16 for a…

A: It is given that the test is two-tailed. Level of significance is 0.05 Degrees of freedom is 19–1…

Q: A study of color in tiger beetles is conducted to support the contention that the proportion of…

A:

Q: For a hypothesis test with alpha level held constant, as sample size increases the critical values…

A: For a hypothesis test with alpha level held constant, as sample size increases.

Q: Suppose a company claims that its market share is less than 16 percent, on average. Several of…

A: The level of significance is 0.01.The test statistic is z = -0.51.The critical value is -2.33.This…

Q: You are testing the null hypothesis that there is no linear relationship between two​ variables, X…

A: Given: From your sample of n=18,you determine that b1=4.6 and Sb1=1.9.

Q: Find the critical value (t- value) that form the boundaries of the critical region for a two-tailed…

A:

Q: carnival game is designed so that approximately 10% of players will win a large prize. If there is…

A: Given X=19 N=100 P=0.19 Alpha=0.05

Q: My original question has already been answered, however, in Step 2 of the Expert Answer I would like…

A: Here, it is known that the degree of freedom for the numerator is 1 and degree of freedom for the…

Q: A random sample of size 625 was selected from a large population with population mean μ = 15 and…

A:

Q: In an experiment designed to measure the time necessary for an inspector's eyes to become used to…

A: The sample size n is 9.

Q: In a previous year, 61% of females aged 15 and older lived alone. A sociologist tests whether this…

A: np(1-p)= 400×0.6×0.4=96>10  Hence, the sample size is under 5%op population size and consider as…

Q: The dose-response effect is best described as A. when similar studies produce similar results…

A: Introduction:The dose-response effect is a measure of the magnitude of the response in the subjects…

Q: The rate of allergies in children was 15% in 2002. A medical researcher is curious whether advances…

A: From the given information, n=500 and x=65.

Q: pothesis test and using either the critical value or p-value approach), and compare your results…

A: 77 50 0 76 69 65 49 62 77 73 57 51 74 67 75 54 56 61 67 62…

Q: You have a population of 100 engineering students at a certain university and you want to interview…

A: Assume, n be the minimum sample size required. N be the population. p^ be the sample proportion of…

Q: Suppose you are testing the null hypothesis that a population mean is less than or equal to 46,…

A:

Q: Under what circumstances can you use a z-test instead of a t-test to compare a sample against a…

A: t test and z-test are the statistical tests that are used to find if the value of the sample mean is…

Q: 1. Using an evenly distributed data population of 8,000 samples, how many Would fall between a…

A: From the provided information, Population size (N) = 8,000 The percentage of population data fall…

Q: What does it imply if if more values are concentrated above the mean? (Skewness) And would the value…

A: Note: Hi, thank you for the question. As per our company guideline we are supposed to answer only…

Q: If I have a sample of 20 people what is my T-threshold for a two-tail test and an alpha of 0.1…

A: Given: Sample size (n)=20 Level of significance α=0.1%=0.001 Test is two tailed.

Q: Your null hypothesis is μ = 12 and your alternative hypothesis is μ ≠ 12 for a population with…

A: It is given that the mean is 12, n is 15 and the level of significance is 0.01.

Q: Nutrition Researchers compared protein intake among three groups of postmenopausal women: (1) women…

A: The test statistic F =10.53 ~ F2,23

Q: In a clinical trial, 24 out of 855 patients taking a prescription drug daily complained of flulike…

A: given that, p=0.023 n=855 α=0.05

Q: 23. If you are doing a two-tailed test and alpha = .05, find the critical value of r from the table:

A: Correlation is an associational statistic.

Q: Suppose a random sample of 320 students was asked to indicate which of 4 candy 'items' they…

A: Chi square χ2 test: Chi square test is used to test whether the distributions of categorical…

Q: You complete a hypothesis test using alpha = .05 and based on the evidence from the sample, your…

A: Researchers do a Hypothesis test to decide what is really happening withe the given data, there are…

Q: Are sexually active teenagers any better informed about AIDS and other potential health problems…

A: Consider that, µ1, µ2, and µ3 define the mean number of teens who are sexually inactive, sexually…

Q: The local swim team is considering offering a new semi-private class aimed at entry-level swimmers,…

A: Introduction: According to the given information, the assumed mean from the previous year’s data for…

Q: A carnival game is designed so that approximately 10% of players will win a large prize. If there is…

A: P-value = 0.0027

Q: The manufacturer of a new antidepressant claims that, among all people with depression who use the…

A: The random variable is people who find relief from depression. The population proportion is 65%. The…

Q: 2. In building an arena, steel bars with a mean ultimate tensile strength of 400 Megapascal (MPa)…

A:

Q: Find the best critical region for testing H:1 = 2 against 0. H: 1 1 = 3 based on the sample drawn…

A: ANSWER: From  the given data,

Q: A major credit card company is interested in the proportion of individuals who use a competitor’s…

A: The test hypotheses are:  H0: p=0.65 vs Ha: p>0.65. It is given that the p0=0.70, the p-value is…

Q: There is a claim that drink driving has been very common in high ways. The Highway Police randomly…

A:

Q: In a previous year, 59% of females aged 15 and older lived alone. A sociologist tests whether this…

A: Given data number of success , x= 246 sample size, n =400 population proportion,p=…

Q: In experimental situations, care is taken to control for as many factors as possible which might…

A: Spearman rank correlation :   The non parametric counterpart of the Pearson product-moment…