Numerade

Questions asked

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Robin Corrigan

Numerade educator

Given the following categorical data: the number of success x = 86, sample size n = 196, and suppose the null hypothesis is Ho : p = 0.16. Find the following: The sample proportion: p̂ = (Round to 3 decimals) The test statistic Z = (Round to 2 decimals)

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Kaushal Nair

Numerade educator

Assume you are creating a 90% confidence interval from a sample with n = 20, x̄ = 49, and s =10. Calculate the margin of error. Give your answer accurate to two decimal places.

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Sanchit Jain

Numerade educator

A population of values has a normal distribution with μ = 48.3 and σ = 4.9 . You intend to draw a random sample of size n = 218. Find the probability that a single randomly selected value is less than 49.1. Enter your answers as numbers accurate to 4 decimal places. P (x < 49.1) = P (x̅ < 49.1) =

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Benjamin Densmore

Numerade educator

In a survey, 22 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $41 and standard deviation of $9. Construct and interpret a 95% confidence interval. Give your answers accurate to two decimal places. The 95% confidence interval =

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T. L.

Numerade educator

In a survey, 14 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $44 and standard deviation of $6. Find the margin of error at a 90% confidence level. Give your answer to two decimal places. E =

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T. L.

Numerade educator

Assume that a sample is used to estimate a population proportion . Find the margin of error E that corresponds to a sample of size 456 with a mean of 81.3 and a standard deviation of 5.2 at a confidence level of 99%. Report E accurate to one decimal place because the sample statistics are presented with this accuracy. E = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

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Ana Carolina Da Cruz

Numerade educator

You wish to test the following claim (Ha) at a significance level of a = 0.10. Ho: p = 0.6 Ha: p > 0.6 You obtain a sample of size n = 645 in which there are 426 successful observations. What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic = What is the p-value for this sample? (Report answer accurate to four decimal places.) p-value =

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Benjamin Densmore

Numerade educator

Assume that a sample is used to estimate a population proportion p. Find the 98% confidence interval for a sample of size 277 with 22% successes. Enter your answer as a tri-linear inequality using decimals (not percents) accurate to three decimal places. < p < Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

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Benjamin Densmore

Numerade educator

Assume that a sample is used to estimate a population proportion p. Find the 90% confidence interval for a sample of size 386 with 290 successes. Enter your answer as a tri-linear inequality using decimals (not percents) accurate to three decimal places. < p < Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

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T. L.

Numerade educator

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately 22.4. You would like to be 90% confident that your estimate is within 1 of the true population mean. How large of a sample size is required?

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Camiko A.