Please use the accompanying Excel data set or accompanying Text file data set when completing the following exercise. An article in Process Engineering (No. 71, 1992, pp. 46-47) presents a two-factor factorial experiment used to investigate the effect of pH and catalyst concentration on product viscosity(cSt). The data are as follows: Catalyst Concentration 2.5 2.7 5.6 192 199 189 198 178 186 179 188 pH 5.9 185 196 204 204 193 185 192 197 (a) Test for main effects and the interaction using a = 0.05. Round your answers to two decimal places (e.g. 98.76). pH: Fo = Catalyst Concentration: Fo= i pH Catalyst Concentration: Fo D

A sociologist wants to determine if the life expectancy of people in Africa is less than the life expectancy of people in Asia. The data obtained is shown in the table below. Africa Asia = 63.3 yr. 1 X,=65.2 yr. 2 o, = 9.1 yr. = 7.3 yr. n1 = 120 = 150

In the process of treating fresh water into mineral water in the production section, the pH value is an important component to monitor. In September 2023, after the annual overhaul, data was collected for 20 days, with 4 times each day. The data for pH value acquisition is detailed in the table next to this. Create a Control Chart that is appropriate for the type of data and the number of samples

Foot ulcers are a common problem for people with diabetes. Higher skin temperatures on the foot indicate an increased risk of ulcers. The article "An Intelligent Insole for Diabetic Patients with the Loss of Protective Sensation" (Kimberly Anderson, M.S. Thesis, Colorado School of Mines), reports measurements of temperatures, in °F, of both feet for 181 diabetic patients. The results are presented in the following table. Left Foot Right Foot 80 80 85 85 75 80 88 86 89 87 87 82 78 78 88 89 89 90 76 81 89 86 87 82 78 78 80 81 87 82 86 85 76 80 88 89 Construct a scatterplot of the right foot temperature (y) versus the left foot temperature (x). Verify that a linear model is appropriate. b. Compute the least-squares line for predicting the right foot temperature from the left foot temperature. If the left foot temperatures of two patients differ by 2 degrees, by how much would you predict their right foot temperatures to differ? Predict the right foot temperature for a patient whose left…

Please use the accompanying Excel data set or accompanying Text file data set when completing the following exercise. An article in Wood Science and Technology, "Creep in Chipboard, Part 3: Initial Assessment of the Influence of Moisture Content and Level of Stressing on Rate of Creep and Time to Failure" (1981, Vol. 15, pp. 125-144) studied the deflection (mm) of particleboard from stress levels of relative humidity. Assume that the two variables are related according to the simple linear regression model. The data are shown below x = Stress level (%) 54 54 61 61 68 68 75 75 75 y = Deflection (mm) 16.473 18.693 14.305 15.121 13.505 11.64 11.168 12.534 11.224 a. Calculate the least square estimates of the intercept (a) and slope (b). What is the estimate of o (c)? b. Find the estimate of the mean deflection if the stress level can be limited to 61% (d). c. Estimate the change in the mean deflection associated with a 7% increment in stress level (e). (a) i (Round your answer to 2…

An article reported data from a study in which both a baseline gasoline mixture and a reformulated gasoline were used. Consider the following observations on age (yr) and NOx emissions (g/kWh): Engine 1 2 3 4 5 6 7 8 9 10 Age 0 0 2 11 7 16 9 0 12 4 Baseline 1.74 4.38 4.04 1.23 5.30 0.58 3.35 3.44 0.73 1.23 Reformulated     1.85     5.93     5.52     2.67     6.54     0.76     4.94     4.87     0.69     1.39   Construct scatter plots of the baseline NOx emissions versus age.         Construct scatter plots of the reformulated NOx emissions versus age.         What appears to be the nature of the relationship between these two variables? As age increases, emissions also increase.As age increases, emissions decrease.    There is no compelling relationship between the data.

An article reported data from a study in which both a baseline gasoline mixture and a reformulated gasoline were used. Consider the following observations on age (yr) and NOx emissions (g/kWh): Engine 1 2 3 4 5 6 7 8 9 10 Age 0 0 2 11 7 16 9 0 12 4 Baseline 1.70 4.38 4.06 1.24 5.29 0.59 3.35 3.45 0.73 1.22 Reformulated     1.86     5.91     5.51     2.70     6.50     0.71     4.95     4.86     0.72     1.41   Construct scatter plots of the baseline NOx emissions versus age.  What appears to be the nature of the relationship between these two variables? There is no compelling relationship between the data. As age increases, emissions also increase.     As age increases, emissions decrease.

An environmental group took a sample from a river under study to check on the biochemical oxygen demand (BOD) of the organisms living in the river. The BOD test was conducted over a period of time (in days). The resulting data follow: Time (days): 1 2 4 6 8 10 12 14 18 20 BOD (mg/liter) 0.6 0.7 1.5 1.9 2.1 2.6 2.9 3.7 3.7 3.8 23 16 3.5

Please help with part c. The first picture has all of the data.

Please select the best answer(s). When we see an interaction effect on an ANOVA, this refers to: The DV affects the IV The combined effect of the IVs on the DV The singular effect of one IV on the DV The combined effect of the IV on another IV