OOIn a random sample of males, it was found that 24 write with their left hands and 219 do not. In a random sample of females, it was found that 60 write with their left hands and 459 do not. Use a0.01 significance level to test the claim that the rate of left-handedness among males is less than that among females. Complete parts (a) through (c) below.The 98% confidence interval is < (P₁-P2) <(Round to three decimal places as needed.).What is the conclusion based on the confidence interval?Because the confidence interval limitsTherethereEDto be a significant difference between the rates of left-handedness among males and females.evidence to support the claim that the rate of left-handedness among males is less than that among femalesc. Based on the results, is the rate of left-handedness among males less than the rate of left-handedness among females?OA. It is not reasonable to conclude that the rate of left-handedness among males is less than the rate of left-handedness among femalesOB. It is reasonable to conclude that the rate of left-handedness among males is the same as the rate of left-handedness among females.It is reasonable to conclude that the rate of left-handedness amona males is less than the rate of left-handedness among females.OC In a random sample of males, it was found that 24 write with their left hands and 219 do not. In a random sample of females, it was found that 60 write with their left hands and 459 do not. Use a0.01 significance level to test the claim that the rate of left-handedness among males is less than that among females. Complete parts (a) through (c) below.OIdentify the test statistic.(Round to two decimal places as needed.)Identify the P-value.P-value=(Round to three decimal places as needed.)What is the conclusion based on the hypothesis test?The P-value isthe significance level of a= 0.01, somales is less than that among females.HEDDthe null hypothesis. Thereevidence to support the claim that the rate of left-handedness among

The question is about hypo. testing and confidence interval Given : Total no. of males in a sample…

Answered: In a random sample of males, it was…

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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n below relates to five brands of tires chosen at random from local stores. Six tires of each brand and placed in random order on a machine that tested tread durability in thousands of miles. the durability measurements are different for different brands at 10% level of significance. Click this button to reveal the data Brand Durability Measure 1 55 1 56 1 59 1 55 1 60 1 57 39 42 43 41 41 222 2 2 2 3 3 3 3 3 3 4 4 4 4 4 4 5 5 5 5 5 5 Download CSV file 2 39 41 3 40 45454442 42 43 43 43 39 40 43 46 42 45 42 42 44
An operations manager wants to know whether the maintenance of a filling machine for 2 litre milk bottles has made a difference in the average fill of the milk bottle. She randomly selects 25 bottles before the maintenance service, and 25 bottles after the maintenance service has taken place. The resulting SPSS output is shown below: Paired Samples Statistics Mean N Std. Deviation Std. Error Mean Pair 1 After Service 2.0029 25 .01142 .00228 Before service 1.9687 25 .03193 .00639 Paired Samples Test Paired Differences t df Sig. (2- tailed) Mean Std. Deviation Std. Error Mean 95% Confidence Interval of the Difference Lower Upper Pair 1 After Service – Before service .03420 .03503 .00701 .01974 .04866 4.882 24 .000 Question: Based on the output choose the most accurate answer
A reviewer checks to see if a bag of candy weighs less than advertised (e.g., 100 grams). What is the appropriate test statistic for each scenario a. One sample Z-test b. One sample t-test c. two related samples t-test d. two indepdent samples t-test
Listed in the accompanying table are heights (in.) of mothers and their first daughters. The data pairs are from a journal kept by Francis Galton. Use the listed paired sample data, and assume that the samples are simple random samples and that the differences have a distribution that is approximately normal. Use a 0.05 significance level to test the claim that there is no difference in heights between mothers and their first daughters. Mother 64.0 66.0 63.0 62.0 66.5 66.0 65.0 60.0 67.0 63.0 Daughter 67.0 66.5 70.5 66.0 61.0 66.0 65.5 65.0 67.0 65.0 In this example, Hd is the mean value of the differences d for the population of all pairs of data, where each individual difference d is defined as the daughter's height minus the mother's height. What are the null and alternative hypotheses for the hypothesis test? Ho: Ha = 0 in. H₁ Hd 0 in. (Type integers or decimals. Do not round.) Identify the test statistic. t= (Round to two decimal places as needed.)
The mean number of sick days an employee takes per year is believed to be about 10. Members of a personnel department do not believe this figure. They randomly survey 8 employees. The number of sick days they took for the past year are as follows: 10; 5; 13; 3; 11; 8; 6; 9. Let X = the number of sick days they took for the past year. Should the personnel team believe that the mean number is about 10? Conduct a hypothesis test at the 5% level.Note: If you are using a Student's t-distribution for the problem, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) What is the test statistic? (If using the z distribution round your answers to two decimal places, and if using the t distribution round your answers to three decimal places.) t = Construct a 95% confidence interval for the true mean. Sketch the graph of the situation. Label the point estimate and the lower and upper bounds of the confidence…
If you have a known value of 16, which of the following is the best average of your data to verify the known value? O 12.5 + 6.02 O 16 + 3.03 O 14.2 + 2.03 O 14.2 + 3.6
A researcher wanted to test whether there is a relationship between preferred sweet (Oreo cookies, Mars bars, or Twinkies) and age group (children, adolescents, or young adults). To test that, subjects from the three age groups were asked which of the three sweets they preferred. Which statistical test should be used to analyze the data? 1. chi square test of independece 2. chi square test for goodness of fit 3. one sample t test 4. one way anova test
Each person in random samples of 227 male and 293 female working adults living in a certain town in Canada was asked how long, in minutes, his or her typical daily commute was. Is there enough evidence to show that there is a difference in mean commute times for male and female working residents of this town? (Use males females) Male Female Sample size X S Sample size x S 227 30.2 24.0 293 27.9 24.3 Find the test statistic. (Round your answer to two decimal places.) Find the df. (Round your answer down to the nearest whole number.) df= Use technology to find the P-value. (Round your answer to four decimal places.) P-value= Is there enough evidence to show that there is a difference in mean commute times for male and female working residents of this town? Use a significance level of 0.05. Yes No
Kindergarten students were participants in a study investigating fine motor skills of 37 children. The children had their fine motor skills measured before the study (a combination of hand use, eye-hand coordination, and manual dexterity) and again after undergoing 7 months of occupational therapy. With the instrument used, high scores indicated stronger fine motor skills. Summary statistics are given below: Difference n Sample Diff Std. Err. Min Max d = Pre - Post 37 -7.8109 2.0715 -36 9 Determine what positive and negative differences mean regarding a student's fine motor skills. Pay attention to the order of subtraction in the output. A positive difference means the Select an answer post-test pre-test score was greater than the Select an answer post-test pre-test , implying fine motor skills were Select an answer weakened strengthened over the 7 months. A negative difference means the Select an answer post-test pre-test score was greater than the Select an answer…
A random sample of 13 men and 19 women in a college class reported their grade point averages (GPAS). A woman in the class says that she believes that college women tend to have higher GPAS than do college men. Does this sample support her claim? Histogram of HGPA Histogram al WGPA 13 20 25 10 as 125 Summary statistics for these data are: 2.898 0.583 Women 3.330 | 0.395 Men What is the test statistic? [Enter t score to 2 decimal places] * Your answer Create and interpret a 95% confidence interval. Enter the low value of confidence interval to four decimal places. Your answer Enter the high value of confidence interval to four decimal places. Your answer
A newspaper article reported that the typical American family spent an average of $86.79 for Halloween candy and costumes last year. A sample of N = 16 families this year reported spending a mean of M = $90, with s = $21. What statistical test would be used to determine whether these data indicate a significant change in holiday spending? single-sample t test z test effect-size test paired-samples t test

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