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Suppose the true proportion of voters in the county who support a specific candidate is 0.64. Consider the sampling distribution for the proportion of supporters with sample size n = 202. What is the mean of this distribution? What is the standard error (i.e. the standard deviation) of this sampling distribution, rounded to three decimal places?
Question 32 0.25/1 pt 398 Details The lengths of pregnancies in a small rural village are normally distributed with a mean of 268 days and a standard deviation of 16 days. In what range would you expect to find the middle 50% of most pregnancies? Between and If you were to draw samples of size 32 from this population, in what range would you expect to find the middle 50% of most averages for the lengths of pregnancies in the sample? Between and Enter your answers as numbers. Your answers should be accurate to 1 decimal places.
In an election, suppose that 50% of voters support creating a new fire district. If we poll 217 of these voters at random, the probability distribution for the proportion of the polled voters that support creating a new fire district can be modeled by the normal distribution pictured below. The bell curve below represents the distribution of these sample proportions. The scale on the horizontal axis is the standard deviation of the sampling distribution. So each tick mark represents a distance of one standard deviation on the distribution, with the middle tick mark being the mean of the distribution. Complete the boxes accurate to two decimal places. Please carefully note where the boxes are located on the horizontal axis. Complete the boxes accurate to two decimal places.
A manufacturer knows that their items have a normally distributed length, with a mean of 13.5 inches, and standard deviation of 2.6 inches. If 10 items are chosen at random, what is the probability that their mean length is less than 11.2 inches? Enter an integer or decimal number [more.] Submit Question Jump to Answer
A population of values has a normal distribution with = 10.4 and o 88.1. You intend to draw a random sample of size n = 20. Find the probability that a single randomly selected value is greater than 28.1. PIX> 28.1)=1 Find the probability that a sample of size n = 20 s randomly selected with a mean greater than 28.1. P(M>28.1) = Enter your answers as numbers accurate to 4 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.
The television show September Road has been successful for many years. That show recently had a share of 25, which means, that among the TV sets in use, 25% were tuned to September Road. An advertiser wants to verify that 25% share value by conducting its own survey, and a pilot survey begins with 15 households have TV sets in use at the time of a September Road broadcast. Find the probability that none of the households are tuned to September Road. P(none) = Find the probability that at least one household is tuned to September Road. P(at least one) = Find the probability that at most one household is tuned to September Road. P(at most one) = If at most one household is tuned to September Road, does it appear that the 25% share value is wrong? (Hint: Is the occurrence of at most one household tuned to September Road unusual?) O yes, it is wrong O no, it is not wrong
Assume that 12 jurors are randomly selected from a population in which 83% of the people are Refer to the probability distribution table below and find the indicated Mexican-Americans. probabilities. I 0 1 2 3 4 0.0002 5 0.0013 6 0.0073 0.0305 0.0931 0.2021 0.296 0.2627 0.1069 78 8 P(x) 9 10 11 12 0+ 0+ 0+ 0+ Find the probability of exactly 6 Mexican-Americans among 12 jurors. Round your answer to four decimal places. P(x = 6) = Find the probability of 6 or fewer Mexican-Americans among 12 jurors. Round your answer to four decimal places. P(x ≤ 6) = Does 6 Mexican-Americans among 12 jurors suggest that the selection process discriminates against Mexican-Americans? O no O yes