Find true proportion of college students believe possibilty
A random sample of 205 college students were asked if they believed that places could be haunted, and 65 of them responded yes. Estimate the true proportion of college students who believe in the possibilty of haunted places with 99% confidence.
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In using the Z-test for comparing two proportions, if the pooled estimate of the proportion of successes is.36, then the pooled estimate of proportion of failures is:
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65 of them responded yes. Estimate the true proportion of college students who believe in the possibilty of haunted places with 99% confidence.
The weight of items produced by a machine is normally distributed with a mean of 8oz. and a std dev of 2 oz. What percentage of items will weigh at least 11.7 oz?
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while Group 2 has 60 respondents and 25% of them like this new product. If the standard error of the difference between proportions is 0.08, what the Z-test value for these data is approximately:
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