Select each of the true statements from the following?
Description
Consider the following data frame of daily air quality measurements made in New York City:
MonthTempOzoneWindSolar.RJun907113.8291Jul88827.4213Sep69710.349Aug908910.3229Sep87477.495Sep73249.7259May65238.6299
where
Month is the month during which the measurement was made
Temp is the maximum daily temperature (in Fahrenheit)
Ozone is the mean ground level ozone concentration (in ppb)
Wind is the average wind speed (in mi/hr)
Solar.R is the solar radiation (in Langleys) in the visible range
Select each of the true statements from the following:
a. The number of variables is 35.
b. The number of cases 35.
c. The value of the 5th variable on the 3rd case is 49.
d. The value of the 3rd variable on the 5th case is 47.
e. All of the variables are quantitative.
2-
Consider the following data frame from a marketing study on US breakfast cereals:
vitaminsmfrshelfcarbocaloriessugarssodiumfibre100%KC20.00100.003.00320.001.00enrichedGB12.00110.0013.00180.000.00enrichedGC24.00173.3310.67280.002.67enrichedGA13.6088.000.80232.001.60enrichedRA22.00110.003.00280.000.00enrichedQC28.00200.0012.00270.004.00enrichedKC30.00180.0012.000.004.00enrichedKA21.00100.002.00290.001.00enrichedGB17.33160.0012.00280.000.00enrichedGB14.0073.332.00173.330.00enrichedPC19.40134.337.46313.437.46enrichedPA12.50113.6417.0551.140.00
where
vitamins indicates whether additional vitamins and minerals were introduced in the manufacturing process and takes the values none
, enriched
, or 100%
mfr is the manufactuer of the cereal, with G=General Mills, K=Kelloggs, N=Nabisco, P=Post, Q=Quaker Oats, and R=Ralston Purina
shelf is the display shelf the cereal is typically sold on (a proxy for the cereal’s cost tier)
carbo is the grams of complex carbohydrates in one serving
calories is the number of calories in one serving
sugars is the grams of sugars in one serving
sodium is the milligrams of sodium in one serving
fibre is the grams of dietary fiber in one serving
Select each of the true statements from the following:
a. The number of variables is 8.
b. The number of cases is 8.
c. The value of the 6th variable on the 8th case is 4.
d. The value of the 8th variable on the 6th case is 2.
e. All of the variables are quantitative.
3-Consider the following data frame of seismic events (i.e., earthquakes) recorded near the island of Fiji:
latlongdepthstations-28.23182.687420-25.23179.8647629-26.18178.5954865-20.04181.8757719-23.00170.704320-23.46180.1754132-24.27179.8852324-13.44166.534427
where
lat is the latitude of the seismic event
long is the longitude of the seismic event
depth is the depth (in km) of the seismic event
stations is the number of seismograph stations that reported the event
Select each of the true statements from the following:
a. The number of variables is 4.
b. The number of cases 8.
c. The value of the 2nd variable on the 3rd case is 178.59.
d. The value of the 3rd variable on the 2nd case is 476.
e. All of the variables are quantitative.
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