We wish to survey students at community college campuses to find out what percent of them prefer taking online classes. We want 95% confidence, and we want the sample percentage to be within 5 percentage points of the population percentage. How large a sample do we need? Round up to the nearest integer (for example, 92.15 would be rounded up to 93).
We wish to survey students at community college campuses to find out what percent of them prefer taking online classes....
We want to estimate the mean weekly earnings of students at a particular college with 95% confidence. How many students must be randomly selected so that the sample mean is within $1 of the population mean? Population standard deviation is known to be $10.
We wish to estimate (with 95% confidence) what percent of students take the bus to school. We survey a random sample of 850 students and get the following results: 70 students take the bus, 770 students do not take the bus and 10 students did not respond We should use: 2-SampTInt TInterval 2-PropZInt ZInterval 1-PropZInt 2-SampZInt
In a study of government financial aid for college students, it becomes necessary to estimate the percentage of full-time college students who earn a bachelor's degree in four years or less. Find the sample size needed to estimate that percentage. Use a 0.02 margin of error and use a confidence level of 95%. Complete parts (a) through (c) below. a. Assume that nothing is known about the percentage to be estimated. (Round up to the nearest integer.) b. Assume prior...
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Question Hop The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first determine the percentage of adults who have heard of the brand. How many adults must he survey in order to be 90% confident that his estimate is within seven percentage points of the true population percentage? Complete...
1. A popular claim, nicknamed "feshman fifteen," states that many college students gain weight point) in their freshman year. You are given the 95% confidence interval as 559% <P < 78 4% Correctly interpret the interval. There is a 95% chance tha the true percentage of college freshmen who gain weight is between 559% and 78 496. 95% of sample college freshmen who gain weight will fall between 55.9% and 78 4% We are confident that 95% of college freshmen,who...
conducted to determine success rates of students enrolled in the Statistics courses offered at South Plains College for the fall semester of 2015. A random sample of 14 students was taken, and we recorded each student's age, final average, gender, # hours worked per week, race, and t attended this semester). Use the results from the following table to answer all parts of #2. he attendance record (# of classes not Age 20 18 19 Final Average Gender # Hrs...
a. You wish to compute the 95% confidence interval for the population proportion. How large a sample should you draw to ensure that the sample proportion does not deviate from the population proportion by more than 0.12? No prior estimate for the population proportion is available. Round intermediate calculations to at least 4 decimal places and "z" value to 3 decimal places. Round up your answer to the nearest whole number.) Sample Size - b. A business student is interested...
A group of business administration students want to conduct a survey in Caguas to find out the demand from residents for vegetarian food. One of the first steps in a pilot study is to estimate the percentage of residents who like vegetarian food. In a previous study it was estimated that the proportion of residents who like vegetarian food is 0.46. To estimate a 95% confidence interval for the proportion of residents who like vegetarian food with no greater than...
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A (1-a) confidence interval procedure ensures that if a large number of confidence intervals are computed, each based on n samples, then the proportion of the confidence intervals that contain the true value should be close to (1-a). True O False Suppose we are required to estimate the output from a simulation so that we are 95% confident that we are within plus or minus 1 of the true population mean. After taking a pilot sample of size...
A research group conducted an extensive survey of 3186 wage and salaried workers on issues ranging from relationships with their bosses to household chores. The data were gathered through hour-long telephone interviews with a nationally representative sample. In response to the question, "What does success mean to you?" 1641 responded, "Personal satisfaction from doing a good job." Let p be the population proportion of all wage and salaried workers who would respond the same way to the stated question. How...