The discharge of industrial wastewater into riversaffects water quality. To assess the effect of a particularpower plant on water quality, 24 water specimens weretaken 16 km upstream and 4 km downstream of the plant.Alkalinity (mg/L) was determined for each specimen, re-sulting in the summary quantities in the accompanyingtable. Do the data suggest that the true mean alkalinity ishigher downstream than upstream by more than 50 mg/L?Use a .05 significance level.StandardLocationMeanDeviationUpstream2475.91.83Downstream24183.61.70

Answered: The discharge of industrial wastewater…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Provide the null and alternative hypotheses used to address these problems. Make sure that your notation is understandable.
Solve all 3 parts of practice question #3. Please and thank you.
Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world. Results from the last five samples are shown in the table. Calculate control limits for a chart that will monitor process consistency. The correct control limits as (LCL,UCL) are: Unit # 1 2 3 4 5 (A) (0.00,6.03). B) (-5.37,5.37). (0.00,5.37). (0.00,6.12). Sample 1 73.5 71.3 70.0 71.1 70.8 Sample 2 70.8 71.0 72.6 70.6 70.7 Sample 3 72.2 73.1 71.9 70.3 70.7 Sample 4 73.6 72.7 72.4 74.2 73.5 Sample 5 71.0 72.2 73.3 73.6 71.1
2.40 Formation thickness and the corresponding porosity data are given in the following table. Calculate the weighted average porosity for the data. Porosity Thickness Porosity Thickness (%) (feet) (%) (feet) 24.2 2.5 13.5 1.5 20.7 1.5 12.2 4.0 18.9 2.0 11.8 3.5 18.0 3.2 16.5 5.5 15.5 4.0 25.2 3.0
A study was carried out to determine the influence of a trace elementfound in soil on the yield of potato plants grown in that soil, defined asthe weight of potatoes produced at the end of the season. A large fieldwas divided up into 14 smaller sections for this experiment. For eachsection, the experimenter recorded the amount of the trace elementfound (in milligrams per metre squared) and the corresponding weightof the potatoes produced (in kilograms). This information is presentedin the worksheet ‘Dataset5’ in the Excel document. Define X as thetrace element amount and Y as the yield.1. Draw a scatterplot of your data set.Page 52. Calculate the coefficients of a linear equation to predict the yieldY as a function of X.3. Calculate the correlation coefficient for the paired data values.4. Set up the framework for an appropriate statistical test to establish if there is a correlation between the amount of the trace element and the yield. Explain how having the scatterplot referredto…
Is the data accurate (mean = 97% of true value or 2% error) or precise (sd < 0.1)? If not, give ONE possible source of error.
Only answer the questions typed: A. indicate whether it's one or two sidedB. Indicate whether it's a test of means or proportionsC. Write out the expression for determining the P-value
Periodically, the county Water Department tests the drinking water of homeowners for contaminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopement of the county are shown below. lead (g/L) 2.9 0.2 5.1 4.2 5.5 1.2 0.133 0.774 0.214 0.671 0.444 0.234 0.357 0.761 0.176 0.888 (a) Construct a 99% confidence interval for the mean lead level in water specimans of the subdevelopment. OSMOSO copper (mg/L) 0.3 1.3 4.9 1.7 (b) Construct a 99% confidence interval for the mean copper level in water specimans of the subdevelopment. OSHSO
c) Given the following ANOVA table: S.V d.f SS MS F-ratio Between Within Total ___ 32 36 191.450 104.720 ________ 47.863 _______ _______ i. Complete the ANOVA table. ii. Do the data provide sufficient evidence to indicate a difference among the treatment means? Test using 1% level of significance.
Samples were collected from two ponds in the Bahamas to compare salinity values (in parts per thousand). Several samples were drawn at each site. Pond 1: 37.03, 37.45, 36.75, 37.54, 37.71, 37.02, 37.32 Pond 2: 38.89, 39.05, 38.51, 38.53, 38.71 Use a 2% significance level to test the claim that the two ponds have the same mean salinity value. Assume that nothing is known about the population distribution of salinities. (a) Enter the rank values in the same order as in the original sample. The rank values for Pond 1 are: The rank values for Pond 2 are: (b) The test statistic is: . (c) The test critical value is: . (d) The conclusion isA. There is not sufficient evidence to indicate that the two ponds have different distributions of salinity values.B. There is sufficient evidence to indicate that the two ponds have different distributions of salinity values.
2. The level of dissolved oxygen in a river is an important indicator of the water's ability to support aquatic life. You collect water samples at 15 randomly chosen locations along a stream and measure the dissolved oxygen. Here are your results in milligrams per liter. 4.53 5.04 3.29 5.23 4.13 5.50 4.83 4.40 5.42 6.38 4.01 4.66 2.87 5.73 5.55 Construct and interpret a 95% confidence interval to estimate the mean dissolved oxygen level in the stream.

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