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Topics: Arithmetic mean, Standard deviation, Variance Pages: 7 (2656 words) Published: October 28, 2014

TUTORIAL 1
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Each of the following processes involves sampling from a population. Define the population, and state whether it is tangible or conceptual. A shipment of bolts is received from a vendor. To check whether the shipment is acceptable with regard to shear strength, an engineer reaches into the container and selects 10 bolts, one by one to test. The resistance of a certain resistor is measured 5 times with the same ohmmeter 8 welds are made with the same process, and the strength of each is measured. A quality engineer needs to estimate the percentage of parts manufactured on a certain day that are defective. At 2.30 in the afternoon he samples the last 100 parts to be manufactured. Determine whether the given value is statistic or parameter

a.A sample of household selected and the average number of people per household is 2.58. b.Currently, 42% of the governors of the United States are Democrats. c.In a study of all 2223 passengers aboard the Titanic, it is found that 706 survived when it sank. d.A sample of Malaysian is selected and the average amount of time watching television is 5.6 hours a day. In each of these statements, tell whether descriptive or inferential statistics have been used. a.Nine out of ten on-the-job fatalities are men

b. Expenditures for the cable industry were $5.66 billion in 1996 c. The median household income for people aged 25–34 is $35,888 d. “Allergy therapy makes bees go away”
e. Drinking decaffeinated coffee can raise cholesterol levels by 7% f. The national average annual medicine expenditure in per person in USA is $1052 g.Experts say that mortgage rates may soon hit bottom

Classify each as nominal-level, ordinal-level, interval-level, or ratio-level data. a. Horsepower of motorcycle engines.
b.Ratings of newscasts in Houston (poor, fair, good, excellent). c. Temperature of automatic popcorn poppers.
d. Time required by drivers to complete a course.
e. Salaries of cashiers of Day-Night grocery stores.
f. Marital status of respondents to a survey on savings accounts. g. Ages of students enrolled in a martial arts course.
h.Weights of beef cattle fed a special diet.
i. Rankings of weight lifters.
j. Pages in the telephone book for the city of Los Angeles.
Classify each variable as qualitative (discrete or continuous) or quantitative. a. Colors of automobiles in the faculty parking lot.
b. Number of desks in classrooms.
c. Classification of children in a day care center (infant, toddler, preschool). d. Weights of fish caught in Lake Pedu.
e. Number of pages in statistics textbooks.
f. Capacity (in gallons) of water in selected dams.
g. Number of off-road vehicles sold in the Malaysia.
Classify each variable as discrete or continuous.
a. Number of loaves of bread baked each day at a local bakery. b. Water temperature of the saunas at a given health spa.
c. Incomes of single parents who attend a community college. d. Lifetimes of batteries in a tape recorder.
e. Weights of newborn infants at a certain hospital.
f. Capacity (in gallons) of water in swimming pools.
g. Number of pizzas sold last year in the Malaysia.
A psychologist wants to study the behavioral patterns of the 8,563 college students at UTEC. She decides to start by obtaining a random sample of 30 students and asking the average number of hours each member of the sample sleeps on a weekday night. For each following questions, identify the type of sampled obtained (simple random, stratified, systematic, cluster, etc) Each student is assigned a number from 1 to 8563. A number from 1 to 285 is randomly selected, and every 285th student on the list from that point on is then included in the sample. Students are separated into academic majors and a proportional number of students are selected from each academic major. Students are listed by number (1 to 8563) and a computer is used to randomly generate a list of 30 numbers representing the students to be used in the sample....
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