Warm-up An Exercise in Sampling: Rolling Down the River

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Warm-up An Exercise in Sampling: Rolling Down the River. What will the treatment be? What will the response variable be? How will the response variable be measured? What will the experimental unit be? Specify the experimental conditions to be used by

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Warm-upAn Exercise in Sampling: Rolling Down the River
• What will the treatment be?
• What will the response variable be?
• How will the response variable be measured?
• What will the experimental unit be?
• Specify the experimental conditions to be used by

considering factors that might have ….what, if anything,

should be done to control this variation.

6. Skip this one…

4.3 E #25 – 26 a and b

25) a. There is radomization of the 10 plants there are split

into the 2 groups. There is replication. Five plants are getting

each of the treatments. There is a control group because 5

plants are replanted in their natural environment.

b. All ten plants need to be dug up so that confounding

variables such as sun/shade are not confounded by dug up

and not dug up.

26) a. The factors are powder and temperature. The levels are

the 2 types of powder and the 3 types of temperature. There

are 6 types of treatments.

b. The metallurgist should use randomization in and test only one

type of treatment at a time since there is only one oven. There

should also be an equal number of powders in randomly selected

areas of the oven.

4.3 # 26 c. and 27

c. This experiment could be blind if an assistant was the

one to randomly selected the powder for each of the 3

temperatures. The metallurgist could record the results.

27. The units in this experiment are the dormitories.

There are 20 dormitories. This is an experimental study.

• Answer all questions on a piece of paper in complete

sentences.

2) BEFORE answering questions, for Sampling Methods B,

C, D draw the 10 x 10 plot and explain how you used your

calculator to do the specified sampling. Also show the

results of the plots chosen using your method.

3) Also be sure to include the table with results

before the observation questions.

4) For Observation #4 we will be writing the results on the

board to the right of the classroom.

5) For Part II redraw the 10x10 plots describe your

methods briefly if you used the same methods.

A.P. Statistics Selected Ch. 3 Test Answers

5. a. for the slope A, B, C was okay because

the residual plot had too much variation. But

c. Is the correlation coefficient a good

measure of association to use with the diameter versus age data?

Briefly explain your answer. In part b. most of you calculated it to be

0.9 and said the association was strong BUT there was a patter in the

residual so the correlation coefficient is not a good measure because

the relationship may not be linear or there may be a lurking variable.

6. For the function 0.735 ∙ year – 59.5; it was important to describe

slope as for every year younger the model of the car was the price

went up \$735. Lost 1 of 2 pts if you were not specific enough.

A.P. Statistics
• 7.
• Solve for R2
• 67% of the variation in calories can be attributed to the amount of fat.
Statistics Common Mistakes on Test

fuel consumption = –5465.5 + 15.50 · speed

5. a. A – C was fine. It was really B.

b. If the standard deviation of the fuel consumption is approximately

976.7 gal/h and the standard deviation of the speed is 54.8 mi/h, find

the correlation between fuel consumption and speed.

c. The residual plot had a pattern so the correlation coefficient,

although it is considered strong, it is not a good indicator of the

relationship between speed and fuel consumption. The U-shape of the

residual means that the relationship is not linear OR that there is a

lurking variable.

Statistics Common Mistakes on Test

8.

b.

c. The R2 is the coefficient of determination which describes the proportion of variation in the diameter that is determined by age.

Be Ready for 4.1 to 4.3 Vocabulary Quiz Next Class

population, sample, sample size, sampling frame,

voluntary response bias, convenience sampling,

judgment samples, size bias, biased sampling

methods, unrepresentative sample, nonresponse bias,

questionnaire bias simple random sample, cluster

sample, probability sample, two-stage sample and

multistage sample, strata, stratified random sample,

lurking variable, confounding variable, experimental

study, observational study, control group, blind study,

double-blind study, experimental units, randomization of

treatment to subjects, replication, factors, levels, randomized

block design, replication

A.P. Statistics and Statistics H.W.
• For those teams that did not win the game, read and define 4.3 and 4.4 terms.
• EVERYONE needs to complete up to #3 on Part 1 of the Rolling Down the River Activity
• EVERYONE should prepare for the 4.1 to 4.3 Vocabulary Quiz