a hypothesis test produces a t statistic of t=2.3. if the researcher is using a two tailed test with a=0.05 how large does the sample have to bw in order to reject the null hypothesis?

Q: From a hypothesis test, James computed the test statistic, Z = 2.94 for a right-tailed test. The…

A: Given that  Test statistics Z = 2.94 Critical value Z = 2.08

Q: A sample of size 10 has a sample mean of 1000 and a sample variance of 100. Then a 90% Confidence…

A: We have given that,  Sample mean (x̄) = 1000 and sample variance (s^2) = 100 and sample size (n) =…

Q: Two random samples of sizesn= 10 and n = 12 from chemistry course and physics course respectively,…

A: Given that  Chemistry mean  Xc= 60  Standard deviation  Sc= 6.5    Physics Mean  Xp= 72  Standard…

Q: Consider that a population is normally distributed with µ= 100 and o= 6. What is the power of a a=…

A: The hypothesis: The hypothesis of interest is: H0: μ = 100 vs. HA: μ ≠ 100, at level of significance…

Q: A sample is selected from a population with u = 50. After a treatment is administered to the…

A: Introduction: Denote μ as the true mean after administering the treatment.

Q: The critical value for a one-tail (upper) hypothesis test when the population standard deviation is…

A: First, we need to identify the type of test we are dealing with. In this case, we are dealing with a…

Q: State the null hypothesis, Ho, and the alternative hypothesis, Ha, that would be used to test these…

A: Given, a) Claim: There is an increase in the mean difference between posttest and pretest scores.…

Q: A nutrition store in the mall is selling "memory booster" which is a concoction of herbs and…

A: Given: μ=20sample mean=26s2=64n=16 a. Hypothesis: Null hypothesis: H0: μ=20Alternate hypothesis: H1:…

Q: A sample of n=25 individuals is randomly selected from a population with a mean of p=65, and a…

A: Given that   x̄ =70 ,  μ = 65  , s = 20 , n =25   Test statistic ( t  )  t = ( x̄ -  μ  )/(s/√(n)

Q: An auto manufacturer claims that its new 4-cylinder Hybrid auto with manual shift averages 50 mpg…

A: Here, the sample mean, x-bar is 48. Population mean, µ is 50. Sample standard deviation, s= 4.…

Q: size n=36 is taken from a normally distributed original population. The sample standard deviation is…

A: The variance is: s2 =72 4949

Q: Arandom sample of 16 statistics examinations from a large population was taken. The average score in…

A:

Q: Summary statistics are given for independent simple random samples from two populations. Use the…

A: Given that, x1¯ = 75.3, s1 = 4.5, n1 = 11, x2¯ = 65.5, s2 = 5.1, n2 = 9

Q: Bob selects independent random samples from two populations and obtains the values p1 = 0.700 and p2…

A:

Q: The scores on a placement test given to college freshmen for the last five years are approximately…

A:

Q: P-value = (Round to three decimal places as needed.)

A: Here n = sample size = 21 T test statistic = 2.309

Q: A sample of 72 values is taken from population that is normally distributed. You are doing a…

A: From the provided information,The test is two tailed.

Q: A sample of n=9 athletes is taken from the SW population that has a M =29. Stress scores are…

A: State the hypotheses. That is, there is no sufficient evidence to conclude that the treatment…

Q: A sample of n=24 is selected from a population = 120 and σ = 40.  If the sample mean is 130, what is…

A: It is given that the population mean, μ=120 and standard deviation, σ=40. For the sample size of 24,…

Q: The breaking strengths of cables produced by a certain company are approximately normally…

A: GivenVariance of breaking strength is 34782.25claim is that the actual variance is higher

Q: Summary statistics are given for independent simple random samples from two (2) populations. Use the…

A: From the given information,

Q: A sample of n=25 individuals is randomly selected from a population with a mean of u=65, and a…

A: For the given data perform t test for one mean

Q: An auto manufacturer claims that its new 4-cylinder Hybrid auto with manual shift averages 50 mpg…

A: Decision rule: Decision rule based on critical value approach: If test statistic ≤ ­­–t critical…

Q: A researcher used a repeated-measures experiment to examine the effectiveness of motivational…

A:

Q: For a one-sample t-test, if other factors are held constant, which set of sample characteristics is…

A: Given that   μ = 100

Q: Random samples of public opinion survey of 31 men and 41 women regarding BT brinjal were  collected.…

A: We want to test the hypothesis

Q: A scientist predicts engineers are more creative than physicians. On a standard creativity test, the…

A:

Q: The results from a two sample (independent sample) t test are reported as “t(14) = 2.13,p > .05, two…

A: Decision Rule: If p-value ≤ α, then reject the null hypothesis.

Q: Test statistic:t= 6.667 Critical value = 2.060 Reject Ho Test statistic:t = 0.718 Critical value…

A: The hypotheses are given below: Null hypothesis: H0: µ1 = µ2 Alternative hypothesis: HA: µ1 > µ2…

Q: We wish to test if a new feed increases the mean weight gain compared to an old feed. At the…

A: Let     μ1:new feedμ2:old feed The hypothesis test is      H0:μ1-μ2=18H1:μ1-μ2>18 The…

Q: a.) us a 0.05 signfigance level to test the claim that those treated with magnets have a greater…

A: Given Data : For treatment x̄1 = 0.55 s1 = 0.84 n1 = 29 For Sham…

Q: Summary statistics are given for independent simple random samples from two populations. Use the…

A:

Q: In a test of hypothesis, the null hypothesis is that the population mean is less than or equal to 32…

A: The null and alternative hypothesis for the test is given as:where,  denotes the population mean.The…

Q: Given a result of t (30) = 1.55 for a one-tailed paired samples t-test, What is the sample size?

A: It is given that t(30) =1.55. That is, t(df) = 1.55 Df = 30

Q: To test the null hypothesis Ho: H1-H2=0 versus the alternative hypothesis H H1 H2 0 at the 0.01…

A:

Q: What would our cutoff Z-score be if we want to do a two-tailed test and use an alpha of .01?

A:

Q: In a certain right-sided test with large amples, the z-statistic of the sample is obtained to be…

A: Followings are the Explanation of the question Provided data  1) Significance level =α = 0.05   2)…

Q: A sample of size 11 produced a variance of 18. Is this sufficient to reject the null hypothesis that…

A:

Q: A researcher conducts an independent- measures research study and obtains t = 2.070 with df = 28.…

A: The given information is that the value of t-test statistic is 2.070 and degrees of freedom is 28.

Q: A researcher wants to know if male and female college students differ with regard to their GPAs. She…

A: Denote μ1, μ2 as the population mean GPAs for male and female college students, respectively. The…

Q: In the comparison of two kinds of paint, a consumer testing service finds that four 1-gallon cans of…

A: We want to test the hypothesis

Q: A researcher conducts an independent- measures research study and obtains t = 2.070 with df = 28.…

A:

Q: In a test of hypothesis, the null hypothesis is that of = ₂ and the alternative hypothesis is 2.…

A: From the provided information,The hypothesis is vs Sample sizes are Sample standard deviations are