A random sample is selected from a normal population with a mean of µ = 30 and a standard deviation of σ = 8. After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 33 a) If the sample consists of n = 16 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with α = .05 b) If the sample consists of n = 64 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with α = .05 c) Comparing your answers for parts a and b, explain how the size of the sample influences the outcome of an hypothesis test?

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Q: A researcher is interested in testing whether chocolate causes hyperactivity in children. To test…

A: Given, n=16 M=102 SS=375 µ = 100 Hypothesis: H0:µ = 100 The sugar does not causes hyperactivity…

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Q: Suppose that memory for unrelated words is distributed normally with a mean of µ = 60 with a…

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Q: To evaluate the effect of a treatment, one sample of n=8 is obtained from a population mean: u=40…

A: Given information Hypothesized mean µ = 40 Sample size (n) = 8 Mean M = 35 Sample variance (s2) = 73…

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A: It is given that confidence level is 0.90, standard deviation is 13 and margin of error E is 5.

Q: 10. A random sample is selected from a normal popula- tion with a mean of u = 30 and a standard…

A: Given: Population parameters are  μ=30 & σ=8             the sample mean, M = 33  To test…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 16 population of normal…

A: Given that  σ = 16E = 4 At 90% the critical value at Zα = 1.645 by standard normal table of Z we…

Q: A researcher is interested in testing whether chocolate causes hyperactivity in children. To test…

A: The mean is 102, the sample size is 16, and the sum of square is 375. The sample standard deviation…

Q: Your decision about ( Ho) A Reject Ho В Fail to reject Ho

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Q: Researchers conducted a study to determine whether magnets are effective in treating back pain. The…

A: Treatment Sham n1=13 n2=13 x¯1=0.49 x¯2=0.43 s1=0.97 s2=1.09

Q: A researcher is interested in testing whether chocolate causes hyperactivity in children. To test…

A: Consider that μ defines the population mean activity level.

Q: A)Calculate the standard error when o=12 and n=4 B) A sample of n=36 nursing students scored a mean…

A: A) Here o = 12 and n = 4 standard error = on= 124=122=6∴Standard error = 6 B) Here given , n=36 and…

Q: Suppose that memory for unrelated words is distributed normally with a mean of µ = 50. A random…

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Q: In a right-tailed test with known population standard deviation, the sample size was 8. At α = 0.05,…

A: The test is right-tailed.The population standard deviation is known.Sample size is .Significance…

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: A random sample of N = 16 healthiness scores is obtained from a population with a known mean, µ = 80…

A: It is given that: The sample size, N=16. The claimed population mean, μ0=80. The sample mean, M=82.…

Q: is there enough evidence to support the​ administrator's claim

A: Given that  Sample size(n)= 76 Sample mean (x¯) = 283 Population standard deviation(σ) = 31 Level of…

Q: A researcher is interested in testing whether chocolate causes hyperactivity in children. To test…

A: Consider that μ defines the population mean activity level.

Q: A random sample of N = 35 individuals is selected from a population with a mean of 60, and a…

A: n=35 Sample sizeμ=60 Population men x= 60.2 Sample mean SS= 296 sum of square s=SSn-1s=29634s=2.9506…

Q: sample is selected from a population with µ = 50. After a treatment is administered to the 16…

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Q: Assume the average amount of days a patient spends in hospital is believed to be 14 days and a…

A: Given Mean=Xbar=12.5 Standard deviation=sigma=4.8 n=sample size=33 mu=14 Alpha=0.05

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Q: A random sample of n = 16 scores is obtained from a population with a standard deviation of σ = 18.…

A: Solution: From the given information, n=16, σ=18, x-bar=86 and z=2.

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A: Given,   Sample size = 100 Sample mean = 5 Sample standard deviation = 1

Q: In a random sample taken from 3 high schools in Albany area the mean GPA of female seniors (N = 526)…

A: Solution: Given information: n1=526 Sample size of sample 1n2= 477  Sample size of sample 2 x1= 2.92…

Q: Calculate i. ii. iii. The sample mean The sample variance A 90% confidence interval for the…

A: It is given that  Σx = 35.9 Σx2 = 186.19

Q: Suppose we want to test H0: μ ≥30  versus  H1: μ < 30.H0: μ ≥30  versus  H1: μ < 30. If we do not…

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Q: A treatment is administered to a sample of n=9 selected from a population with a population =80 and…

A: The sample size n is 9.

Q: What is the effect size  (r2) ?

A: It is given that the value of SS = 375 and n =16.

Q: When only two treatments are involved, ANOVA and the Student’s t-test (Chapter 11) result in the…

A: Anova is the measure that used to determine the mean significance between more than three groups. It…

Q: The population mean ACT composite score in 2015 was 20.8 points, with population standard deviation…

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