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...
Recent research indicates that the effectiveness of antidepressant medication is directly related to the severity of the depression (Khan, Brodhead, Kolts & Brown, 2005). Based on pretreatment depression scores, patients were divided into four groups based on their level of depression. After receiving the antidepressant medication, depression scores were measured again and the amount of improvement was recorded for each patient. The following data are similar to the results of the study. Low Moderate High Moderate Moderately Severe Severe 1.2...
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...
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...
The data below shows the sugar content in grams of several brands of children's and adults' cereals. Create and interpret a 95% confidence interval for the difference in the mean sugar content, mu Subscript Upper C Baseline minus mu Subscript Upper AμC−μA. Be sure to check the necessary assumptions and conditions.(Note: Do not assume that the variances of the two data sets are equal.) Full data set Children's cereal: 43.8 comma43.8, 59.2 comma59.2, 48.2 comma48.2, 44.7 comma44.7, 53 comma53,...
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...