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3. Historically, evening long-distance calls from a particular city have averaged 15.2 minutes per call. In...
Historically, evening long-distance phone calls from a particular city have averaged 12 minutes per call. In...
Historically, evening long-distance phone calls from a particular city have averaged 12 minutes per call. In a random sample of 20 calls, the sample mean was 10.7 minutes per call, with a standard deviation of 4 minutes. Does the sample indicate that there has been a change in the mean duration of long distance phone calls? Test the appropriate hypothesis at the 10% level of significance. (Be sure to state the hypotheses and report your conclusion). [5 marks] Part B:...
5. Inferential Statistics - Hypothesis Testing Historically, evening long-distance calls from a particular city have averaged...
5. Inferential Statistics - Hypothesis Testing Historically, evening long-distance calls from a particular city have averaged 16.2 minutes per call. In a random sample of 41 calls, the sample mean time was 17.8 minutes. Assume the (sample) standard deviation is known to be 6 minutes. Using 0.05 level of significance, is there sufficient evidence to conclude that the average evening long-distance call has increased? Explain through the use of a one-tailed test (as in examples in the notes).
Historically, evening long-distance calls phone calls from a particular city have averages 12 minutes per call....
Historically, evening long-distance calls phone calls from a particular city have averages 12 minutes per call. In a random sample of 20 calls, the sample mean was 10.7 minutes per call with a standard deviation of 4 minutes. Does the sample indicate a change in the mean duration of long distance calls? Test the hypothesis at 10% level of significance, state the hypothesis and report your conclusion. a. estimate the p-value and show your work.
pense QUESTION 1 A long distance phone company wishes to estimate the mean duration of long-distance...
pense QUESTION 1 A long distance phone company wishes to estimate the mean duration of long-distance calls originating in California. A random sample of 15 long-distance calls originating in California yields the following call durations, in minutes 2 5 14 11 22 28 32 21 16 15 1 19 12 2 37 Use the data to obtain a point estimate of the mean call duration for all long-distance calls originating in California 15.3 minutes 13.8 minutes 15,8 minutes 13.9 minutes...
Question 1 A study was conducted to estimate μ, the mean number of weekly hours that...
Question 1 A study was conducted to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard deviation is assumed to be σ = 3.6 hours. A similar study conducted a year earlier estimated that μ, the mean number of weekly hours that U.S. adults use computers at home,...
1. Many companies use a incoming shipments of parts, raw materials, and so on. In the...
1. Many companies use a incoming shipments of parts, raw materials, and so on. In the electronics industry, component parts are commonly shipped from suppliers in large lots. Inspection of a sample of n components can be viewed as the n trials of a binomial experimem. The outcome for each component tested (trialD will be that the component is classified as good or defective defective components in the lot do not exceed 1 %. Suppose a random sample of fiver...
A Waist is a Terrible Thing to Mind: The waist circumference of males 20 to 29...
A Waist is a Terrible Thing to Mind: The waist circumference of males 20 to 29 years ele is approximately normally distributed, with mean 92.5 cm and standard deviation 13.5 Source: M.A. McDowell. CD. Fryar.R. Hirs for Children and Adults: U.S. Population. 1999-2002. Advance data from vital and health statistics: No. 361. Hyattsville, MD: National Center for Health Statistics, 2005. d CL. Ogden, Anthropometric Reference Data 5. Draw a normal curve with the parameters labeled. 92.5 What proportion of 20-...
TEST 1: ANSWERS INTS EACH). This section takes around 5 minutes. Name Spring 2019 8) A researcher wants to determine whether female teachers give higher or lower grades, on average, then male t...
TEST 1: ANSWERS INTS EACH). This section takes around 5 minutes. Name Spring 2019 8) A researcher wants to determine whether female teachers give higher or lower grades, on average, then male teachers. She picks a random sample by picking a random sample of schools, in the schools picked, picking a random sample of departments, and in the departments picked, picking a random sample of teachers. What kind of sampling was performed? d) voluntary response e) cluster b) stratified Random...
5. Inferential Statistics - Hypothesis Testing Historically, evening long-distance calls from a particular city have averaged 16.2 minutes per call. In a random sample of 41 calls, the sample mean time was 17.8 minutes. Assume the (sample) standard deviation is known to be 6 minutes. Using 0.05 level of significance, is there sufficient evidence to conclude that the average evening long-distance call has increased? Explain through the use of a one-tailed test (as in examples in the notes).
pense QUESTION 1 A long distance phone company wishes to estimate the mean duration of long-distance calls originating in California. A random sample of 15 long-distance calls originating in California yields the following call durations, in minutes 2 5 14 11 22 28 32 21 16 15 1 19 12 2 37 Use the data to obtain a point estimate of the mean call duration for all long-distance calls originating in California 15.3 minutes 13.8 minutes 15,8 minutes 13.9 minutes...
1. Many companies use a incoming shipments of parts, raw materials, and so on. In the electronics industry, component parts are commonly shipped from suppliers in large lots. Inspection of a sample of n components can be viewed as the n trials of a binomial experimem. The outcome for each component tested (trialD will be that the component is classified as good or defective defective components in the lot do not exceed 1 %. Suppose a random sample of fiver...
A Waist is a Terrible Thing to Mind: The waist circumference of males 20 to 29 years ele is approximately normally distributed, with mean 92.5 cm and standard deviation 13.5 Source: M.A. McDowell. CD. Fryar.R. Hirs for Children and Adults: U.S. Population. 1999-2002. Advance data from vital and health statistics: No. 361. Hyattsville, MD: National Center for Health Statistics, 2005. d CL. Ogden, Anthropometric Reference Data 5. Draw a normal curve with the parameters labeled. 92.5 What proportion of 20-...
TEST 1: ANSWERS INTS EACH). This section takes around 5 minutes. Name Spring 2019 8) A researcher wants to determine whether female teachers give higher or lower grades, on average, then male teachers. She picks a random sample by picking a random sample of schools, in the schools picked, picking a random sample of departments, and in the departments picked, picking a random sample of teachers. What kind of sampling was performed? d) voluntary response e) cluster b) stratified Random...
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