Reference no: EM132847930
You measure 35 watermelons' weights, and find they have a mean weight of 50 ounces. Assume the population standard deviation is 6.3 ounces. Based on this, construct a 90% confidence interval for the true population mean watermelon weight.
Give your answers as decimals, to two places.
SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many students should you sample? Make sure to give a whole number answer.
Assume that a sample is used to estimate a population proportion p. Find the margin of error M.E. that corresponds to a sample of size 349 with 79.9% successes at a confidence level of 99%.
M.E. = %
Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. Round final answer to one decimal place
Giving a test to a group of students, the grades and gender are summarized below
A B C Total
Male 13 2 3 18
Female 15 10 12 37
Total 28 12 15 55
Let π represent the percentage of all male students who would receive a grade of C on this test. Use a 80% confidence interval to estimate p to three decimal places.
Enter your answer as a tri-linear inequality using decimals (not percents).
A political candidate has asked you to conduct a poll to determine what percentage of people support her.
If the candidate only wants a 6% margin of error at a 95% confidence level, what size of sample is needed?
Give your answer in whole people.
If n = 440 and p^ (p-hat) = 0.2, construct a 90% confidence interval.
Give your answers to three decimals
Less than 16% of phone numbers in a certain city are unlisted. Express the null and alternative hypotheses in symbolic form for this claim (enter as a percentage).
H0:p
H1:p
Use the following codes to enter the following symbols:
≥ enter >=
≤enter <=
≠enter !=
Test the claim that the mean GPA of night students is smaller than 2.4 at the 0.01 significance level.
Based on a sample of 30 people, the sample mean GPA was 2.36 with a standard deviation of 0.07
The p-value is: (to 2 decimals)
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Topic - Improving confidence when public speaking
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Confidence interval for the true population mean
: Assume the population standard deviation is 6.3 ounces. Based on this, construct a 90% confidence interval for the true population mean watermelon weight.
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What percent of students score between 80 and 92
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