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To find value of sample proportion.
1. Eighty-eight shoppers were interviewed at random, and 59 said that they prefer to shop alone.
a. What is the value of q-hat?
b.. Find a 90% confidence interval for p.
2. A sample of 19 albino Hungarian banded aardvarks was examined for nose length. Since this is a small sample, how various degrees of freedom will be used to find the t-score?
Sketch the distribution of sample means for sample of n = 25 scores from this population.
A company has developed the new battery, but the average lifetime is unknown. In order to estimate the average, a sample of 150 batteries is tested and an average lifetime of this sample is found to be 250 hours.
Write down the name of 4 parts of the regression equation.
In a binomial distribution n = 8 and π = 0.2. Determine the probabilities of the following events.
When the level of confidence and sample size remain the same, a confidence interval for a population proportion π will be __________ when p(1-p) is larger than when p(1-p) is smaller.
In each of the following situations, the sampling frame does not match the population, resulting in undercoverage. Give examples of population members that might have been omitted:
Using a 5% level of significance, is there any difference in proportion of guests who would select the two resorts? What is your conclusion?
Illustrate what was the lowest score earned on the exam. Explain how many students scored within 3 standard deviations of the mean.
Extra college-level training, and rest of the sailors arn't accounted for. How does your sample compare to what you expected to determine? Define null hypothesis.
Questions based on binomial distribution, variance of the binomial distribution, discrete random variable and continuous random variables.
A noted psychic was tested for ESP. The psychic was presented with 400 cards face down and asked to determine if each card was marked with one of four symbols: a star, cross, circle, or square. The psychic was correct in 120 cases. Let p represent..
If a group is chosen from a population on the basis of sharing the same percentages of trait features as known to exist in the population, then the group so chosen would constitute:
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