one-tailed or two-tailed test:State the Hypotheses;df=ta or t value for the critical regionsM =%3Dt DDecision: 3. A nutrition store in the mall is selling "Memory Booster," which is a concoction ofherbs and minerals that is intended to improve memory performance. To test theeffectiveness of the herbal mix, a researcher obtains a sample of n=16 people and askseach person to take the suggested dosage each day for four weeks. At the end of thefour-week period, each individual takes a standardized memory test. The scores from thesample produce a mean of M= 26 with s= 8 (SS= 960). In the general population, thestandardized test is known to have a mean of µ = 20. Does the sample data support theconclusion that the Memory Booster has a significant effect? Test with a=.05.

Answered: one-tailed or two-tailed test: State…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The personality trait of "Conscientiousness" (someone who is organized, responsible, and can control their impulses) has μ = 120 and σ =9. Test whether ARC students (n = 9, M = 126) differ on Conscientiousness. α = .05. Does the z score for the sample mean lie in the critical region (beyond the critical boundary)?
According to the National Highway and Traffic Safety Administration, the proportion of fatal traffic accidents in the United States in which the driver had a positive blood alcohol concentration (BAC) is 0.36. Suppose a random sample of 105 traffic fatalities in the state of Hawaii results in 51 that involved a positive BAC. A) Determine the sample proportion of traffic fatalities in the state of Hawaii involving a positive BAC. E) Determine the p-value for the hypothesis test F) Draw a normal curve with an area representing the P-value shaded G) Interpret the value
Which two fields of the ANOVA summary table help us find the critical value? Select all that apply A.df between B.MS within C.df within D. MS between
The president of a university is in need of an academic vice president and wants the approval of more than 50% of the faculty for his candidate. He wants statistical significance and the absolute value. Out of 120 randomly selected faculty members, 65 approved. Is this sufficient to appoint the candidate? Use 0.05 level of significance. Write the research hypothesis Determine the critical region and z-value Whats the decision?
What is the critical t score if you are testing a one-tailed hypothesis, α level of .05 with df = 35? Group of answer choices
What is measured by the numerator of the -score test statistic? the likely distance between M and that would be expected if H 0 was false the distance between the sample mean and hypothesized population mean the position of the sample mean relative to the critical region the boundaries for the critical region (s)
A severe storm has an average peak wave height of 16.4 feet for waves hitting the shore. Suppose that a storm is in progress with a severe storm class rating. Let us say that we want to set up a statistical test to see if the wave action (i.e., height) is dying down or getting worse. If you wanted to test the hypothesis that the waves are dying down, what would you use for the alternate hypothesis? Is the P-value area on the left, right, or on both sides of the mean? a. H1 : μ is less than 16.4 feet; the P-value area is on the right of the mean b. H1 : μ is not equal to 16.4 feet; the P-value area is on the right of the mean c. H1 : μ is not equal to 16.4 feet; the P-value area is on the left of the mean d. H1 : μ is greater than 16.4 feet; the P-value area is on the right of the mean e. H1 : μ is less than 16.4 feet; the P-value area is on the left of the mean
A random survey of 90 women who were victims of violence found that 24 were attacked by relatives. A random survey of 60 men found that 10 were attacked by relatives. At a=0.05. can it be shown that the percentage of women who were attacked by relatives is different from the percentage of men who were attacked by relatives? Compute the test value. Round sample proportions to three decimal places and z score values to two decimal places. Find the critical values. Do we reject or not reject the null hypothesis?
A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent study. A sample of 60 women over the age of 50 used the new cream for 6 months. Of those 60 women, 50 of them reported skin improvement(as judged by a dermatologist). Is this evidence that the cream will improve the skin of more than 40% of women over the age of 50? Test using α=0.05 test statistics z=? rejection region z>? The final conclustion is A. We can reject the null hypothesis that p=0.4 and accept that p>0.4 That is, the cream can improve the skin of more than 40% of women over 50.B. There is not sufficient evidence to reject the null hypothesis that p=0.4 That is, there is not sufficient evidence to reject that the cream can improve the skin of more than 40% of women over 50.
A fast food restaurant estimates that the mean sodium content in one of its breakfast sandwiches is no more than 921 milligrams. A random sample of 36 breakfast sandwiches has a mean sodium content of 909 milligrams. Assume the population standard deviation is 25 milligrams. At α=0.10, do you have enough evidence to reject the restaurant's claim? -Identify Ho and Ha. -Find the critical value and sketch the region -Calculate the test statistic -Do you reject Ho or fail to reject Ha
Q17. What type of estimation that surrounds the point estimate with a margin of error to create a rang of values that seek to capture the parameter? a. Inter-quartile estimationB. Quartile estimationC. Intermediate estimationD. None of the above
i. Should we reject the null? ii. justify the decision using the p-value and draw athe sampling distribution and shade the area by hand corresponding to p value. iii. justify your decision in i using 95 confidnce interval for Beta 1.

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one-tailed or two-tailed test: State the Hypotheses; df3D ta or t value for the critical region = sM = t D Decision: