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Refer to a study described in a Sacramento Bee article titled "Much Ado Over Those Bad Hairdos" (January 26, 2000, p. A21). Here is part of the article:
Researchers surveyed 60 men and 60 women from 17 to 30, most of them Yale students. They were separated into three groups. One group was questioned about times in their lives when they had bad hair. The second group was told to think about bad product packaging, like leaky containers, to get them in a negative mind-set. The third group was not asked to think about anything negative. The groups were tested for self-esteem and self-judgment, and the bad hair group scored lower than the others.
Discuss each of the following "difficulties and disasters" in the context of this research.
a. Ecological validity.
b. Extending results inappropriately.
c. Experimenter effect.
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
in 1997 frequent flyer magazine reported that 71 of frequent fliers surveyed complained that they had difficulty
Find the probability that their mean energy consumption level for September is greater than 1075 kWh.
The odds in favor of an event are the number of successes divided by the number of failures. The probability of this event occurring is the number of successes divided by the sum of the number of successes and the number of failures.
Would you suspect that the IDEA surveys sent to South students each term could be biased in the responses received? Why or why not?
Why is a z score a standard score? Why can standard scores be used to compare scores from different distributions?
Cables is selected and tested find the sample mean that will cut off the upper 95% of all the sample of 20 taken from the population. Assume the variable is normally distributed.
1.assuming the population is large which sample size will give the smallest standard deviation to the statistic?a.n
What are the key components of consideration that went into forming the Texas Constitution?
Someone selects one ball randomly from each box. So totally, three balls are taken out from three boxes. Find the probability that there are exactly one white ball among selected 3 balls.
The number of shark attacks and deaths over a recent 5- year period is shown. Find the mean, median, mode, midrange, variance, and standard deviation for the date. Which data set is more valuable?
how large a sample is needed to guarantee that the distribution of sample means is approximately normally distributed?
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