
The FloridaLakes dataset describes characteristic of water samples taken at random Florida lakes. Acidity (pH) is...
The FloridaLakes dataset describes characteristic of water samples taken at random Florida lakes. Acidity (pH) is given for each lake. Pure water has a pH of 7, which is neutral. Solutions with a pH less than 7 are acidic while solutions with a pH greater than 7 are basic or alkaline. The researchers would like to know whether on average the solutions in Florida lakes are acidic. The following two problems are based on this dataset. Problem 1 This problem...
4. The FloridaLakes dataset describes characteristic of water samples taken at random Florida lakes. Acidity (pH) is given for each lake. Pure water has a pH of 7,which is neutral. with a pH less than 7 are acidic while solutions with a pH greater than 7 are basic or alkaline. A rcher Jim Lee would like to know whether on average the solutions in Florlida lakes are acidic. In order to test whether on average the solutions in Florida lakes...
t est to gather oation. The outut of this What is the p-value of this test? What is the conclusion? (3 credins) Assume that the distribution of the pH Sevel is normal with ox1.20. Test 7 uing a twotaled test (significance level 001). (4 creds) n.:μ " 7 verm / μ c) Assume that the distribution of the pH level is normal with σ120. Test p7 versus H:p <7 using a one-tailed test (significance level 0.01). (3 credits) As in...
The pH of a liquid is a measure of its acidity or alkalinity. Pure water has a pH of 7, which is neutral. Solutions with a pH less than 7 are acidic while solutions with a pH greater than 7 or basic or alkaline. A random sample of lakes in Florida was taken and the pH was recorded for each lake. Summary statistics are given below. The primary question to answer is: "Is there evidence to indicate the mean pH...
2. [20 marks] Fresh water from rivers and lakes varies in acidity/alkalinity depending on the rocks and soils it runs over. Granite country yields water that is slightly acidic, while water from limestone country is slightly alkaline. Acidity and alkalinity are measured on a pH scale, on which 7 is neutral, values below 7 are acidic and values above 7 are alkaline. pH can change due to pollution or due to waste from biomass such as algae. A certain river,...
19. Do orange trees in California produce more oranges than those in Florida? Twenty orange trees were randomly selected in California and another twenty in Florida. Use the SPSS output below to answer questions a-d. Write the correct answer on the line next to the question's number Group Statistics Stale N Mean Std. Deviation Std. Error Mean 7 810 .746 3499 est OrangesPerTree CA 20 98.45 FL 15.649 Levene's Test for Equaity of Variances -Hest for Equality of Means 95%...
Using the dataset that you used for the midterm (Find it on the Blackboard), do the following: 1) (4 points) Submit the values for items a to e in the table below: mean, sample size, standard deviation, and 95% confidence interval for mean. (SPSS Command: Analyze/Descriptive Statistics/Explore) Variable Statistic Height Mean 71.2 Sample Size N 999 Standard Deviation 2.913 95% Confidence Interval for Mean Lower Bound 71.02 Upper Bound 71.38 2) (4 points) Assume that you want to test whether...
Local government is worried that runoff from a corporate farm has caused water in a nearby stream to become acidic. The pH is used to measure the acidity/alkalinity of a substance. Pure water, for instance, has a pH of 7, and smaller pH values indicate acidity, while larger values indicate alkalinity. A contractor is hired to test the hypothesis that the water is significantly acidic. Use this information to answer questions 3 and 4. 3) Select the correct null and...
A study was conducted to evaluate the effectiveness of a weight loss program. Among 36 obese individuals aged 55 to 75 years randomly selected into the study, each individual had his/her BMI computed before and after the program. The decrease in the BMI was recorded into a SAS dataset and proc univariate was used to analyze this dataset. The population m ean of the decrease in the BMI is denoted by μ. Use the SAS output on the following page...
Open the "Lab Dataset"
(HSCI390.sav) you have been using for lab assignments in SPSS. Your
analysis will focus on the variables "Gender" (Gender) and "Blood
Alcohol Content at last drinking episode" (BAC).
Researchers are interested in examining if the mean Blood
Alcohol Content at last drinking episode differs between men and
women. To examine their research question of interest, they will
use data from the sample of CSUN students contained in the
HSCI390.sav dataset.
Using SPSS for the analysis, you...