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3. A psychologist is studying learning in rts. The psychologist wants to determine the average ti...
A study found that subjects slept on average 20 minutes less on nights of the full moon than othe...
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A study found that subjects slept on average 20 minutes less on nights of the full moon than otherwise. Other researchers disagree and are interested in testing whether the mean difference in sleep is less than 20 minutes. A random sample of 100 subjects showed that they slept, on average, 10 minutes less on nights of the full moon than otherwise. Assume the population standard deviation is 15 minutes. Use a 0.01 significance level. 2. Underline the...
A researcher wants to test whether a certain sound will make rats do worse on learning...
A researcher wants to test whether a certain sound will make rats do worse on learning tasks. It is known that an ordinary rat can learn to run a particular maze correctly in 19 trials, with a standard deviation of 5.(The number of trials to learn this maze is normally distributed.) The researcher now tries an ordinary rat in the maze, but with sound. The rat takes 35 trials to learn the maze. Complete parts a and b below. (a)...
Math 203 Ch 8 Identify Worksheet Date 1. The U.S. Department of Commerce reports that 41.6%...
Math 203 Ch 8 Identify Worksheet Date 1. The U.S. Department of Commerce reports that 41.6% of Internet users preferred DSL as their method of service delivery. A random sample of 1000 Internet users shows 350 who preferred DSL Test whether the population proportion who prefer DSL has decreased, using level the 0.10 level of significance Underline the sentence or portion of the sentence that indicates the hypotheses. Identify the hypothesized population mean / proportion (with notation: Identify the sample...
1) A furniture retailer is studying the amount of time it takes their salespeople to arrange...
1) A furniture retailer is studying the amount of time it takes their salespeople to arrange for delivery. The retailer takes a sample of n = 25 times and computes a sample average of 5.2 minutes and a standard deviation of 2.4 minutes. b) Provide a 95% confidence interval on the standard deviation of the time required to arrange for delivery.
1) A professor knows that in the past, the average amount of time spent studying the...
1) A professor knows that in the past, the average amount of time spent studying the night before the first exam was 140 minutes with a normal distribution and a standard deviation of 75.1. The professor finds that the average amount of time spent studying the night before the first exam for the current class of 40 students is 165 minutes. a) Please identify the following values from the above study description. The population mean (µ) equals ________________. The population...
The researcher from the Annenberg School of Communications is interested in studying the factors that influence...
The researcher from the Annenberg School of Communications is interested in studying the factors that influence how much time people spend talking on their smartphones. She believes that gender might be one factor that influences phone conversation time. She specifically hypothesizes that women and men spend different amounts of time talking on their phones. The researcher conducts a new study and obtains data from a random sample of adults from two groups identified as women and men. She finds that...
1. To determine the average number of hours spent studying by college students per week, a...
1. To determine the average number of hours spent studying by college students per week, a sample of 39 students was randomly selected, and found to spend an average of 17.1 hours per week, with a standard deviation of 4.3 hours. Find the 90% confidence interval for the mean number of hours spent studying per week by all college students. What is the upper and lower bound? 2. If I asked a random student how many hours they study per...
Suppose the math department chair at a large state university wants to estimate the average overall...
Suppose the math department chair at a large state university wants to estimate the average overall rating, out of five points, that students taking Introductory Statistics gave their lecturers on their end-of-term evaluations. She selects a random sample of 32 evaluations and records the summary statistics shown. Sample size Sample mean Sample standard deviation Population standard deviation Standard error Confidence level ? ?⎯⎯⎯ ? ? ??⎯⎯⎯⎯ ? 32 3.9102 1.0809 1.0213 0.1805 95% The department chair determines the standard error...
Suppose the math department chair at a large state university wants to estimate the average overall...
Suppose the math department chair at a large state university wants to estimate the average overall rating, out of five points, that students taking Introductory Statistics gave their lecturers on their end-of-term evaluations. She selects a random sample of 36 evaluations and records the summary statistics shown. Sample size Sample mean Sample standard deviation Population standard deviation Standard deviation of ?¯ Confidence level ? ?⎯⎯⎯ ? ? ??⎯⎯⎯⎯ ? 36 3.8711 1.0755 1.0222 0.1704 95% The department chair determines the...
It is desired to determine the average concentration of lead in the water of a river....
It is desired to determine the average concentration of lead in the water of a river. It uses a preliminary sample to estimate the variability. The preliminary sample indicates that the standard deviation is 0.4 Microg. a) To estimate the lead we must first obtain the sample size that guarantees that the experiment is successful. Determine the sample size required to obtain an error in the average estimate of 0.05 g with 90% confidence. b) Obtain the confidence interval for...
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A study found that subjects slept on average 20 minutes less on nights of the full moon than otherwise. Other researchers disagree and are interested in testing whether the mean difference in sleep is less than 20 minutes. A random sample of 100 subjects showed that they slept, on average, 10 minutes less on nights of the full moon than otherwise. Assume the population standard deviation is 15 minutes. Use a 0.01 significance level. 2. Underline the...
Math 203 Ch 8 Identify Worksheet Date 1. The U.S. Department of Commerce reports that 41.6% of Internet users preferred DSL as their method of service delivery. A random sample of 1000 Internet users shows 350 who preferred DSL Test whether the population proportion who prefer DSL has decreased, using level the 0.10 level of significance Underline the sentence or portion of the sentence that indicates the hypotheses. Identify the hypothesized population mean / proportion (with notation: Identify the sample...
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