a)
sample mean =
2.354545 |
sample sd =
0.653244 |
95 % confidence interval =
(1.916, 2.793)
b)
lower critical value= 3.247
upper critical value = 20.483
he 95% confidence interval is 0.2083 1.3142
5.6.8. It is known that some brands of peanut butter contain impurities within an acceptable level....
1 A+ L At a hazelnut spread factory in Chelsea, 12 jars are randomly selected and examined. The following percentage of impurities are reported: 2.3 1.9 2.1 2.8 2.3 3.6 1.8 2.1 3. 2 2 1.9 1.4 a. Find a point estimate for u, the average percentage of impurities. b. Find a point estimate for 02, the variance of percentages of impurities. C. Find a 90% confidence interval for u. d. Find a 95% confidence interval for o?. At a...
Question 1. Samples of peanut butter produced by three different manufacturers are examined for aflatoxin content, and the results are shown in the table. The data are also available in a separate file on Canvas. We will use analysis of variance to test whether the three brands differ in mean aflatoxin content. Nowe 0 inawa Brand A Brand B 3.5 3.3 0.0 7.7 6.2 2.5 3.9 7.8 4.6 5.8 5.5 3.6 3.0 3.4 5.4 0.0 7.3 5.1 3.2 5.6 3.5...
A sociologist claims that children spent more time watching television in 1981 than children do today. A study was conducted in 1981 to find the time that children watched television on weekdays. Recently, a similar study was conducted. The results of these studies (in hours per weekday) are shown below. Assume the population standard deviation is 0.7 for 1981 and 0.7 for today. At Î±=0.05, can you support the sociologist's claim? Complete parts (a) through (d) below. 1981 3.2 1.4...
Parametirc test or not:Test statistic:p-value:decision:Is There A Difference Between the Means?6.7 6.2 3.1 310.3 10 5 5.56.9 5.5 3.3 3.110.5 6.3 4.3 5.44.5 4.6 1.8 25.6 5.6 2 2.65.9 6.1 2.1 2.58 11.7 4 4.68 7.4 3.3 3.15.8 5.2 3.1 2.96 7.3 3.0 3.28.7 5.3 2.7 36 5.5 2.1 2.27.2 6.3 3.5 3.25.9 4.6 2.9 3.46 7.4 3 3.37.2 7.8 3.7 3.48.6 9.4 5.1 5.77.2 8.1 2.8 3.15.8 5.4 2.2 1.83.3 4 1.7 1.86.8 5.1 2 1.83.7 3.5 2.2 2.112...
Indoor natatoriums or swimming pools are noted for their poor acustic properties. The goal is to design a pool such that the average time that it takes low-frequencies sound to die is at most 1.3 seconds with standard deviation of at most .6 second. Computer simulations of a preliminary design are conducted to see whether these standards are exceeded. These data are obtained on the time required for a low- frequency sound to die: Data: 1.8, 3.7, 5.0, 5.3, 6.1,...
A sociologist claims that children spent more time watching television in 1981 than children do today. A study was conducted in 1981 to find the time that children watched television on weekdays. Recently, a similar study was conducted. The results of these studies (in hours per weekday are shown below. Assume the population standard deviation is 0.7 for 1981 and 0.8 for today, At a = 0.05, can you support the sociologist's claim? Complete parts (a) through (d) below. Full...
Thirty fast-food restaurants including Wendy's, McDonald's and Burger King were visited during thesummer of 2000 (The Cincinnati Enquirer, July 9, 2000) During each visit, the customer went to thedrive-through and ordered a basic "combo" meal or a sandwich, fries and shake. The time betweenpulling up to the menu board and receiving the filled order was recorded. The time in minutes for the30 visits are in column A.a. Provide a point estimate of the population mean drive-through time at fast-food restaurants.b....
2. (25pts) Two different brands of latex (water-based) paint are being considered for use in a large construction project. To choose between the brands, one of the key factors is the time it takes the paint to dry. Engineers sampled 22 specimens of each brand and measured the drying times (in hours) of each specimen. The data collected are given in Table 1 below Specimen Brand A Brand B Specin Brand A Brand B 3.5 2.7 3.9 4.2 4.6 2.7...
solvel only E F G H below is pat data 3. A hospital administrator wished to study the relation between patient satisfaction (Y) and patients age (Xi, in years), severity of illness (X2, an index) and anxiety level (X3, an index). The administrator randomly selected 23 patients and collected the data in pat, where larger values of Y, X2 and X3 are, respectively, associated with more satisfaction, increased severity of illness and more anxiety. The data is saved in Moodle2...
Human Development Data Set: Questions are posted in next post. C1-T INTERNET GDP CO2 CELLULAR FERTILITY LITERACY Algeria 0.65 6.09 3 0.3 2.8 58.3 Argentina 10.08 11.32 3.8 19.3 2.4 96.9 Australia 37.14 25.37 18.2 57.4 1.7 100 Austria 38.7 26.73 7.6 81.7 1.3 100 Belgium 31.04 25.52 10.2 74.7 1.7 100 Brazil 4.66 7.36 1.8 16.7 2.2 87.2 Canada 46.66 27.13 14.4 36.2 1.5 100 Chile 20.14 9.19 4.2 34.2 2.4 95.7 China 2.57 4.02 2.3 11 1.8 78.7...