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The Grocery Manufacturers of America reported that 76% of consumers read the ingredients listed on a product's label. Assume the population proportion is p .76 and a sample of 400 consumers is selected from the population.
a. Show the sampling distribution of the sample proportion where is the proportion of the sampled consumers who read the ingredients listed on a product's label.
b. What is the probability that the sample proportion will be within .03 of the population proportion?
In a normal distribution of 1,000 aptitude test scores, with a mean of 60 and a standard deviation of 8, how many scores fall:
If is the proportion of the next 100 shoppers that buy a packet of the crackers after tasting a free sample, then the probability that fewer than 30% buy a packet after tasting a free sample is approximately.
Tired of careless spelling and grammar, a company decides to administer a test to all job applicants. The test consists of 20 sentences. Applicants must state whether each sentence contains any grammar or spelling errors.
Organize the above data as a less-than cumulative frequency distribution and draw to scale the less-than ogive for the above data.
A survey of 600 non-fatal accidents showed that 111 involved the use of a cell phone. Find a point estimate for p, the population proportion of accidents that involved the use of a cell phone.
Popcorn kernels take between 100 and 200 seconds to pop. What sample size (number of kernels) would be needed to estimate the true mean seconds to pop with and error of 5 seconds and 95% confidence level?
testing for equality of variances.independent random samples were taken from normal distributions of the yearly
How much does the low temperature vary on this date? In other words calculate the variance and standard deviation?
In StaTScan what is the difference between a spatial cluster size to 25% of the population risk and one with 50% window ? In StaTScan what is the difference between space-time permutation and space-time?
Barbara Flynn is in charge of maintaining hospital supplies at General Hospital. During the past year, the mean lead time demand for bandage BX-5 was 60 (and was normally distributed).
Computing the probability values using normal distribution - what proportion of licensed drivers are less than 30 years old?
Do the data indicate a significant difference between the frequency distributions for male and females? Test at the .05 level of significance and describe the difference.
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