Government agencies carefully monitor water quality and its effect on wetlands.† Of particular concern is the concentration of nitrogen in water draining from fertilized lands. Too much nitrogen can kill fish and wildlife. Twenty-eight samples of water were taken at random from a lake. The nitrogen concentration (milligrams of nitrogen per liter of water) was determined for each sample. (a) Identify the variable. ( Multiple Choice ) nitrogen concentration amount of water     the 28 samples nitrogen concentration in the entire lake   (b) Is the variable quantitative or qualitative? ( Multiple Choice ) quantitative neither quantitative nor qualitative     both quantitative and qualitative qualitative   (c) What is the implied population? ( Multiple Choice ) the 28 samples that were examined all the fish in the lake     all lakes the entire lake.

Eye Color f % Amber 5 4.81% Blue 8 7.69% Brown 82 78.85% Gray 3 2.88% Green 2 1.92% Hazel 3 2.88% Red/Violet 1 0.96% Total 104 100.00%   Comment on your finding

A Hospital record for a patient indicates the patient's assigned department, room location and number of days the patient was treated.  Classify each variable as qualitative or quantitative. A sample data table is listed below.   Department Room Location Days of Treatment Maternity A102 2  Cardiac G210 5 Orthopedic C309 3

−13,−13,−13,0,0,0,11−13,−13,−13,0,0,0,11 Determine if the data set is unimodal, bimodal, multimodal, or has no mode. Identify the mode(s), if any exist.

use the OLS approach to estinstimate relationship between maize yields and fertilizer applications given the table below; interpret your results. maize yields; 31, 36, 29, 34, 62, 60, 45, 31, 42, 48 fertilizer; 23, 25, 19, 35, 32, 54, 26, 20, 18, 23

For each vignette, choose the type of research that is being conducted. There is only one correct answer for each vignette. Here are your answer choices for questions 1-18   Case Study                                                                       Naturalistic Observation Laboratory Observation                                                Survey Correlation                                                                      Test Experiment                                                                      Longitudinal Design Cross Section                                                                   Cross Sequential Design   Maria wants to understand the political demographics in her community, so she creates a questionnaire asking people to identify their age, gender, political affiliation, religion and marital status. After Maria collects the abovementioned data (in question #12), she then identifies the relationships between religion and political affiliation. Kathi…

A medical researcher measures the increase in heart rate of patients who are taking a stress test. What kind of variable is the researcher studying? Choose the correct answer below. Identifier variable Ordinal variable Categorical variable Quantitative variable

Determine whether the value is from a discrete or continuous data set. Volume of liquid in a glass is 350 mL Is the value from a discrete or continuous data set? O Discrete O Continuous

Consider the population of all laptop computers owned by students at your university. You want to know the weight of the laptop. (a) Specify the population unit. (b) Specify the variable of interest. (c) Specify the statistical population.

For each of the variables described below, indicate whether it is a quantitative or a categorical (qualitative) variable. Also, indicate the level of measurement for the variable: nominal, ordinal, interval, or ratio. Make sure your responses are the most specific possible.   Variable Type of variable Level of measurement (a)Temperature (in degrees Fahrenheit)   Quantitative   Categorical   Nominal   Ordinal   Interval   Ratio (b)Exchange on which a stock is traded (NYSE, AMEX, or other)   Quantitative   Categorical   Nominal   Ordinal   Interval   Ratio (c)Letter grade (A, B, C, D, or F)   Quantitative   Categorical   Nominal   Ordinal   Interval   Ratio