Question 4: ANOVA Five servings each of three different brands of processed meat were tested for fat content. The following data (in fat percentage per gram) resulted. Brand 1 Brand 2 Brand 3 32 41 36 34 32 37 31 34 30 35 29 28 33 35 33 1. Does the fat content differ depending on the brand? 2. Find confidence intervals for quantities u1- 42 that, with 95 percent confidence, are valid.
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- QUESTION 8 The mean labour productivity (output per worker per hour, in Rand) of a random sample of 26 textile manufacturers that export their products to foreign markets is R180.40 (with a standard deviation of 51.7). Likewise, the mean labour productivity of an independent random sample of 21 textile manufacturers that do not export their production is 159.30 (with a standard deviation of 42.9). Suppose that labour productivity is normally distributed for both types of manufacturing firms. Using this information, the 90% confidence interval for the standard deviation of the labour productivity of non-exporting textile manufacturers is for the lower limit and for the upper limit. (Note: You must write your final answers to 3 decimal places. When writing your answers, use "." (e.g. 3.250) instead of "," (i.e. 3,250) with no spaces between digits).question #2 2. A recent survey showed that from a sample of 500 packages delivered by a Postal Service,480 were delivered on time. a) Construct a 95% confidence interval for the proportion of all packages that are delivered on time by the Postal Service. b) The manager of the Postal Services claims that 98 percent of their mail are delivered on time. Test at the 1% significance level to determine whether the true proportion is less than 98 percent.QUESTION 1 The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours. A random sample of 64 light bulbs indicates a sample mean life of 350 hours. (a) At the 0.05 level of significance, is there evidence that the mean life is different from 375hours? (b) Compute the p-value and interpret its meaning. (c) Construct a 95% confidence interval estimate of the population mean life of the light bulbs. (d) Compare the results of (a) and (c). What conclusions do you reach? Note: please clear Whois on answer (a), (b),(c), +d)
- QUESTION 1 The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours. A random sample of 64 light bulbs indicates a sample mean life of 350 hours. (a) At the 0.05 level of significance, is there evidence that the mean life is different from 375hours? (b) Compute the p-value and interpret its meaning. (c) Construct a 95% confidence interval estimate of the population mean life of the light bulbs. (d) Compare the results of (a) and (c). What conclusions do you reach? Note: i need only (d) no question answerQuestion 4 In a sample of 400 shops it was discovered that 136 of them sold carpets at below the list prices, which had been recommended by manufacturers. (a) Estimate the percentage of all carpet selling shops below list price. (b) Calculate the 95% confidence limits for this estimate.Question 26 The % of alcohol content is normally distributed for the mouthwash of brand A, with a standard deviation σ of 5%. We have measured the alcohol content of 13 mouthwashes of brand A, and the sample standard deviation is 7%. What is the 95% lower confidence interval for σ?
- QUESTION 34 A study is run comparing HDL cholesterol levels between men who exercise regularly and those who do not. The data are shown below. Regular Exercise N Mean Std Dev Yes 35 48.5 12.5 No 120 56.9 11.9 Generate a 95% confidence interval for the difference in mean HDL levels between men who exercise regularly and those who do not.QUESTION 4 The table below contains data about the English reading comprehension scores (on a scale of 1-100) of a random sample of five Grade 7 learners, before and after they received supplemental workbooks. Assume that the reading comprehension scores of these learners are normally distributed.Using this information, the difference between the sample means (using sample of X - sample of Y method or mean of X -mean of Y method) is? the standard deviation of the differences between the sample means is? . Further, the 99% confidence interval for the mean difference in reading comprehension scores before and after the receipt of the supplementary workbooks is for the lower limit and for the upper limit. More so, the value of the test statistic that must be used to test the hypothesis that the mean reading comprehension scores before receipt of the supplementary workbooks were less than the mean reading comprehension scores after receipt of the supplementary workbooks, rounded…Question 7:Many medical professionals believe that eating too much red meat increases the risk of heartdisease and cancer (WebMD website, March 12, 2014). Suppose you would like to conduct asurvey to determine the yearly consumption of beef by a typical American and want to use 3pounds as the desired margin of error for a confidence interval estimate of the populationmean amount of beef consumed annually. Use 25 pounds as a planning value for the population standard deviation and recommend a sample size for each of the followingsituations.a. A 90% confidence interval is desired for the mean amount of beef consumed.b. A 95% confidence interval is desired for the mean amount of beef consumed.c. A 99% confidence interval is desired for the mean amount of beef consumed.
- question #8 A fitness center is interested in finding a 95% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 238 members were looked at and their mean number of visits per week was 3.2 and the standard deviation was 1.6. b. With 95% confidence the population mean number of visits per week is between ____ and ____ visits. c. If many groups of 238 randomly selected members are studied, then a different confidence interval would be produced from each group. About ____- percent of these confidence intervals will contain the true population mean number of visits per week and about ____ percent will not contain the true population mean number of visits per week. Please solve for blankQuestion 9: compute a 95% confidence interval for the average blood pressure range of any individual that will take the blood pressure medication.8.3 (Question 5) Table #8.3.8 contains pulse rates after running for 1 minute, collected from females who drink alcohol ("Pulse rates before," 2013). Find a 95% confidence interval for the mean pulse rate after exercise of women who do drink alcohol. 176 150 150 115 129 160 120 125 89 132 120 120 68 87 88 72 77 84 92 80 60 67 59 64 88 74 68