2.) A researcher is interested in the number of words four-year-old children understand in an unfamiliaraccent. On average four-year-olds understand an average of μ = 1,500 words with a standard deviation of o= 72 words. A random sample of n-64 four-year-olds complete a study identifying objects labeled in anunfamiliar accent. The sample had a mean score of M = 1485. Does accented speech influence a child'sunderstanding? Test at the a=.05 level.a.) Step 1: State the HypothesesHo:H₁:b.) Step 2: Determine the critical region and draw it on the distribution above: Zritical-c.) Step 3: Calculate the test statistics (here: a z-test). Zobserved =d.) Step 4: Make a decision.Circle one: Reject Null (Ho) or Fail to Reject Null (Ho)e.) State your conclusions about the research scenario in sentence form:f.) What is the estimated effect size (Cohen's d) in this study? Do you characterize it as being small,medium or large?d=

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Answered: 2.) A researcher is interested in the…

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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Dr. Addison wants to examine if a training program has an effect on weekly reading. College students read a mean of 2.3 days a week with a standard deviation of 1.6 days. Dr. Addison's sample of 29 students read a mean of 2.4 days a week. What can be concluded with a = 0.10? a) What is the appropriate test statistic? ---Select-- b) Population: |--Select-- Sample: --Select--- c) Obtain/compute the appropriate values to make a decision about Ho. Critical Value = Test Statistic = Decision: ---Select--- d) If appropriate, compute the CI. If not appropriate, input "na" for both spaces below. [ e) Compute the corresponding effect size(s) and indicate magnitude(s). If not appropriate d = and select "na" below. ; Magnitude: |---Select-- ; Magnitude:---Select-- f) Make an interpretation based on the results. O Individuals that went through the training program did significantly more reading than college students. O Individuals that went through the training program did significantly less…
I don't know how to find the z-score for each state
It is known that rats run a standard maze in an average of 25.4 seconds. A researcher is trying to see if a drug affects the running time of rats. In a random sample of 43 rats, it is found that they ran the maze in 23.6 seconds with a standard deviation of 5.1 seconds. Is this good evidence at the 2% level that the running time is different after taking the drug? Provide a 1-2 sentence explanation of what your results mean in addition to appropriately stating your results in a complete sentence. Is there anything about this problem suggesting that the methods we learned should not be applied?
5- Level refers to a categorical quantity under examination in an experiment as a possible cause of variation in the response variable. Select one: True False
6. A psychology professor of a large class became curious as to whether the students who turned in tests first scored differently from the overall mean on the test. The overall mean score on the test was 75 with a standard deviation of 10; the scores were approximately normally distributed. The mean score for the first 20 students to turn in tests was 78. Using the .05 significance level, was the average test score earned by the first 20 students to turn in their tests significantly different from the overall mean?
A college entrance exam company determined that a score of 24 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 200 students who completed this core set of courses results in a mean math score of 24 3 on the college entrance exam with a standard deviation of 3.7. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 24 on the mathematics portion of the exam? Complete parts a) through d) below. E a) State the appropriate null and alternative hypotheses. Fill in the correct answers below. The appropriate null and alternative hypotheses are H -24 versus H₂H b) Verify that the requirements to perform the test using the t-distribution are satisfied. Check all that apply. >24 A. The sample data come from a…
Students in the senior capstone course (N=36) at Central State University took the Political Science subtest developed by the National Board Testing Association. The test is a 75-item, multiple choice test covering all areas of political science. The national norms for the test show a mean of 50. The mean for the students in the capstone course was 55, with a standard deviation of 15. Did the students at CSU score significantly higher than the national average? State your null and alternative hypothesis Is this a one-or-two tailed hypothesis? Explain thoroughly. Calculate the appropriate statistical test. Can you reject the null hypothesis? Why or why not?
A USA based cable broadband company wants to investigate whether it's east coasts customers have a higher average customer satisfaction score than compared to it's west coast customers. The customer survey asks for a score between 1 and 5, with 1 being poor and 5 being excellent. 174 east coast customers are surveyed, and the sample mean is 3.35 with a sample standard deviation of 0.51. For the west coast, 355 customers are surveyed, and the sample mean is 3.24 with a sample standard deviation of 0.52.
QUESTION 3 A wholesaler must decide how many computers to purchase before they know how many they will be able to sell to local retailers. The wholesaler purchases the computers for S300 each and sells them to retailers for $350 each. If the wholesaler is not able to sell them to a retailer then the wholesaler can return them to the manufacturer (for a refund of the S300 cost), but the wholesaler must pay $40 per computer that it returns to the manufacturer (in shipping, handling, and insurance costs). The following probability distribution describes the number of computers the wholesaler may possibly sell to local retailers: there is a 21% chance that they will sell 900 computers, a 56% chance that they will sell 1200 computers; otherwise, they will sell 1500 computers. What is the expected number of computers the wholesaler will sell? (please round your answer to 1 decimal place)
Scores on a standard IQ Test for people aged 20 to 34 are normally distributed with mean 110 and standard deviation 25. (a) A researcher wants to select the men in the bottom 25% on this intelligence scale. How low must a man score (IQ)to be selected? (b) A researcher wants to select the men in the top 15% on this intelligence scale. How high must a man score(IQ) to be selected?
Determine if the outcome is unusual. Consider as unusual any result that differs from the mean by more than 2 standard deviations. That is, unusual values are either less than u - 20 or greater than u + 20. According to AccuData Media Research, 36% of televisions within the Chicago city limits are tuned to "Eyewitness News" at 5:00 pm on Sunday nights. At 5:00 pm on a given Sunday, 2500 such televisions are randomly selected and checked to determine what is being watched. Would it be unusual to find that 981 of the 2500 televisions are tuned to "Eyewitness News"? Yes O No
The Fair Isaac Cooperation (FICO) credit score is used by banks and other lenders to determine whether someone is a good credit risk. Scores range from 330 to 850, with a score of 720 or more indicating that a person is a very good credit risk. An economist wants to determine whether the mean FICO score is lower than the cutoff of 720. She finds that a random sample of 60 people had a mean FICO score of 685 with a standard deviation of 80. Can the economist conclude that the mean FICO score is less than 720? Use the a=0.10 level of significance and the P-value method

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