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Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in a popper. After popping, the unpopped kernels were counted. There were 86. (a) Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. (b) Check the normality assumption. (c) Try the Very Quick Rule. Does it work well here? Why, or why not? (d) Why might this sample not be typical?
The following data (in pounds), which were selected randomly from a normally distrubuted population of values, represent mearsurements of a machine part that is supposed to weigh, on average, 8.3 pounds.
What would be the minimum sample needed to estimate the population mean of the length of carrots using Gro-Haut to within 1.5 cm with 99% confidence?
Calculate the mean, median, and standard deviation for ounces in the bottles and construct a 95% Confidence Interval for the ounces in the bottles.
What percent of healthy young adults has osteoporosis by the WHO criterion? Suppose that the standard deviation is the same as for young adults. What percent of this older population has osteoporosis?
A researcher wishes to estimate the number of households with two cars. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 4%? A previous study indicates that ..
First part of this theorem allows a problem solver to compute probabilities about sample means regardless of whether a population is normally distributed.
What is the relationship between sales and the amount spent on advertising? The owner collected data for the past year by month. The data is in millions of dollars.
What is the probability that a carpet that is 8 metres by 10 metres contains no flaws? Use an appropriate Excel function and write down the formula shown in the formula bar.
Hypothesis test of difference between two means based on independent random samples, which one of the given is correct rejection region at significance level of .05?
Survey on marital status to determine whether the data is qualitative or quantitative
Test hypothesis that two processes have identical fractions nonconforming. Use a = 0.05. Create 90% confidence interval on difference in fraction nonconforming between two processes.
To find the probabilities values of standard normal variable
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