Experimental Design
Analyzing Data
Probability
Vocabulary
Inference
100
Blinding and a control and the most important aspect in minimizing the _____ _____.
Placebo effect
100
Which of the following statements is false? I. All normal curves are bell shaped and symmetric. II. All symmetric histograms have only one peak.
II. All symmetric histograms have only one peak
100
An average height for a Chanhassen High School female is 622 inches, what is the standard deviation if 15% of them are under 60 inches?
1.923
100
Neither the subjects nor those who measure the response variable know which treatment a subject received.
What is double-blind experiment
100
True or False? The probabilty of a Type I error plus the probability of a Type II error alsways equals 1?
False
200
Because a sample statistic is used to estimate a population parameter ____ ____ occurs.
Sampling error
200
A survey on youth and smoking contacted by telephone 300 smokers and 300 non-smokers, all 14-22 years of age. What is the name of this sample survey?
A sample survey
200
A book company advertises that 71% of its books are durable. In an SRS of 50 books, what's the expected number that will be in bad condition(not durable)?
35.5
200
To compare the responses to the two treatments in a matched pairs design or before-and-after measurements on the same subjects, apply one-same t procedures to the observed differences.
What is paired t procedures
200
The number of 911 calls per day in a small midwestern town is noted for a sample of 90 days with the mean=33.4 S= 4.7. With what degree of confidence can we assert that the mean number of 911 calls per day in this town is between 32.4 and 34.4?
.9525
300
A teacher wants to survey her college algebra classes which have a total of 87 students. She puts all 87 names on separate sheets of paper of identical size and drops them into a box. She then shakes the box and picks 10 sheets of paper from it. Which type of sampling is this procedure an example of?
Simple random
300
Given 2 independent random variables, x with mean 13.2 and standard deviation 1.1, and y with a mean 10.5 and standard deviation 2.4, which statement is true about x-y? A. mean of x-y is lower than .5 B. mean of x-y is higher than 2.7 C. mean of x-y=.5 D. mean of x-y=2.7
D. mean of x-y=2.7
300
If P(A)=.4 and P(A or B)=.6 what is the probability P(B) if A or B are mutually exclusive?
.2
300
If the probability calculations involved in that procedure remain fairly accurate when a condition for use of the procedure violated.
What is robust
300
Which of the following statements are true? I. The p-value can be negative or positive depending upon whether the sample statistic is less than or greater than the claimed value of the population parameter in the null hypothesis. II. the p-value is based on a specific test statistic. So it must be chosen before an experiment is conducted. III. If the population parameter is known, there is no reason to run a hypothesis test on that population parameter. IV. All of the above statements are true!
Only I
400
When designing experiments we try to avoid ______ because it can result in confusion as to which variable is causing an effect.
Confounding
400
When there are suspected outliers which is best to measure of center and variability?
Median/interquartile range
400
It's estimated that 30% of all drivers ran red lights. In a random sample of 5 drivers, whats the probability that at least one runs a red light?
83.2%
400
A family of distributions that take only positive values and are skewed to the right.
What is chi-square distributions
400
A quantity inspector plans to test a sample of 50 bottles of soft drink labeled as 21 oz. If she finds the mean content to be less than 20.8 oz. She will have the bottling meachinery stopped and recalibrated. If it is known that the machine operates with a standard deviation of 1.25 oz. what is the probabilty that the inspector will mistakenly stop a machine that is delivering a mean of at least 300 oz. per bottle.
.129
500
Questionnaires with non neutral wording are likely to have ____ ____.
Response bias
500
Ability to grom in shade may help pines found in the dry forests of Arizona to resist drought. How well do these pines grow in shade? Investigators planted pine seedlings in a greenhouse in either full light, light reduced to 25% of normal by shade cloth, or light reduced to 5% of normal. At the end of the study, they dried the young trees and weighed them.
Experimental units: pine seedlings. Factor: light intensity. Treatments: full light, 25% light, and 5% light. Response variable: dry weight at the end of the study
500
Suppose you have a binomial, and you have (n/8)P^8 (.74)^14. Find n?
P=1-.74 = .26 8+14= 22 22(.26) = 5.72
500
row total x column total/n
What is expected cell count
500
In a random sample of 35 High school students, each were interviewed as to GPA and weekly hours worked at a part time jobs. What is the critical t-value in calculating a 95 percent confidence interval estimate for the slope of the resulting least squares regressing line
Df=n-2 Df= 35-2=33 On calculator: invt(.95,33) =1.69
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