15. b. Test statistic = ?c. P-value = ? d. Reject/Accept null hypothesis ? A 9-year-old girl did a science fair experiment in which she tested professional touch therapists to see if they could sense her energy field.She flipped a coin to select either her right hand or her left hand, and then she asked the therapists to identify the selected hand by placingtheir hand just under her hand without seeing it and without touching it. Among 284 trials, the touch therapists were correct 126 times. Use a0.10 significance level to test the claim that touch therapists use a method equivalent to random guesses. Do the results suggest that touchtherapists are effective?

Answered: A 9-year-old girl did a science fair…

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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10. Use the given confidence interval to find the margin of error and the sample mean. (15.0,22.4) The sample mean is The margin of error is (Type an integer or a decimal.) . (Type an integer or a decimal.)
10) The average height of males in the freshmen class of a certain college has been 68.5 inches. Is there a reason to believe that there has been no change in the average height if a random sample of 50 males in the present freshmen class has an average height of 69.7 inches with a standard deviation of 2.7 inches? Use a 0.01 level of significance. Solution: I. Statement of the Hypothesis: Но H1 II. Statistical Test: III. Level of Significance and Critical Value: IV. Computed value of Z: V. Conclusion:
Which two quantities are needed to estimate the standard error of the proportion‘s toward the further estimation of confidence interval‘s for proportion’s? A) sample mean and sample standard deviation B) sample proportion in sample size C) population proportion in population size D) population mean and population standard deviation ( don't Hand writing solution)
07 A statistics professor wants to determine whether the average grade on Assignment 1 differs significantly from 23 (A average). a) State the null and alternative hypotheses. b) Based on the t-test in the following table 1, make a decision regarding the null hypotheses. c) Explain the results observed in (b). assign1 assign1 t -4.944 N dif 15 14 Mean 21.0333 Std. Deviation 1.54072 Test Value = 23 Mean Sig. (2-tailed) Difference .000 -1.96667 Table 1: T-test Std. Error Mean 39781 95% Confidence Interval of the Difference Lower Upper -2.8199 -1.1134
4. The amount of juice from a dispenser has a normal distribution with a mean of 240ml. A random sample of 10 glasses of juice dispensed from the machine had a mean of 200ml and a standard deviation of 130 ml. A test was carried out at the 5% level of significance to determine if on average the machine does not dispense 240ml of juice. a) State, in symbols, appropriate null and alternative hypothesis for the test. b) Calculate the critical value for the test. c) Calculate the test statistic. d) State, with reason, your decision and conclusion for this test.
urgent please
Suppose the number of observations in a sample is 30, sample mean is 73 and sample standard deviation is 13. Perform a test of null hypothesis is `population mean is equal to 72` and the alternative hypothesis is `population mean is greater than 72`. (Use 5% significance level) a) 0.42: accept the null b) -0.42: reject the null c) 0.25: accept the null d) -0.25: reject the null
15. Claim: The mean pulse rate (in beats per minute) of adult males is equal to 69 bpm. For a random sample of 156 adult males, the mean pulse rate is 69.6 bpm and the standard deviation is 10.9 bpm. Find the value of the test statistic. The value of the test statistic is (Round to two decimal places as needed.)
Average heart rate for Americans is 72 beats/minute. A group of 25 individuals participated in an aerobics fitness program to lower their heart rate. After six months the group was evaluated to identify is the program had significantly slowed their heart. The mean heart rate for the group was 69 beats/minute with a standard deviation of 6.5. Was the aerobics program effective in lowering heart rate? a) What would be the null hypothesis and alternative hypothesis in this study? b) What is your tcrit(t critical value) ? c) Is there a significant difference between the two groups? d) Interpret your answer. e) Write out your t-value in APA format. *ANSWER ALL PARTS OF THE QUESTION*
WHO (World Health Organization) states that 1500 cals is the average daily calorie intake for the people in Hatay. A group of 100 people are selected from there, and the mean and standard deviation of the daily calorie intake are found to be 1700+HI cals and 900 cals, respectively. Use 5% significance level and; a) Perform a test of hypothesis if the WHO statement about the daily average calorie intake still holds? b) Find the probability of committing a Type II error and calculate the Power of Test when the real average is 1800+HI. H is 3 and I is 2
cutive pusu 8. A survey will be conducted on the use of social media among senior high school students. a. How large a sample must be obtained if the researchers want to be 95% confident that the maximum error will not exceed 5%? b. Suppose the researchers conducted the survey involving 500 senior high school students and 400 responded that they have social media accounts. Give the 99% confidence interval for the true proportion of senior high school students who have social media accounts.
17. Confidence interval is for population parameter and prediction interval is for a variable . Select one: True of false

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