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We are doing a study on shampoo buyers in Walmart stores across the US and we send them online surveys. Based on past studies, we know that of the people who start the survey, 80% qualify for the study, and only 40% of these people who do qualify actually complete the survey. Of the people who complete the survey, 10% of respondents are removed due to invalid or low quality answers. If we want 1000 valid responses for this particular study, how many people do we need to have start the survey?
Estimate the number of workers in the sample who are union members by giving the mean of the relevant distribution (that is, the expectation of the relevant random variable). Do not round your response.
Suppose an advocacy organization surveys 960 canadians and 192 of them report being born in another country. Is a two-sided or a one-sided alternative hypothesis more appropriate here? find the p-value of the observed difference
The gestation period for human births can be taken as normally distributed with a mean of 266 days and a standard deviation of 16 days.If a gestation period is 276 days, what percentile among human births is this?
Find a 95% confidence interval estimate of the population proportion who think that it should be illegal to use a cellular telephone while driving.
Find the probability that Mimi scores at least 3 of the 10 field goals. (round the answer to 3 decimal places) Show all work. Just the answer
The property is a large mansion house on a main thoroughfare in a medium-sized city. It was constructed originally in 1917 to house the family of Oscar W
Write a few sentences comparing the number of male and female licensed drivers in each age group.
Show the graph of the probability density function for flight times. What is the probability that the flight will be no more than 5 minutes late?
the number of viewers of american idol has a mean of 29 million with a standard deviation of 10 million. assume this
The contractor took 27 water samples and found an average pH of 6.3 with a sample standard deviation of 1.86. What is the test statistic for this sample?
Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviation are equal.
Of the 1755 qualified applicants, 931 were accepted, 298 were waitlisted, and 526 were turned away for lack of space. Find the relative frequency distribution of the decisions made, and write a sentence describing it.
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