1) Babcock and Marks (2010) reviewed survey data from 2003–2005, and obtained an average of μ...

1) Babcock and Marks (2010) reviewed survey data from 2003–2005, and obtained an average of μ = 14 per week spent studying by full-time students at four-year colleges in the United States. To determine whether this average has changed in recent years, a researcher selected a sample of n = 64 of today’s college students and obtained an average of M = 12.5 hours . If the standard deviation for the distribution is σ = 4.8 per week, does this sample indicate a significant change in the number of hours spent studying? Use a two-tailed test with α = .05. Report Cohen’s d to indicate the size of the effect if necessary. Step 1,2,3,4,5,6

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orchestra answered 2 years ago

1) Babcock and Marks (2010) reviewed survey data from 2003–2005, and obtained an average of μ...

1) Babcock and Marks (2010) reviewed survey data from 2003–2005, and obtained an average of μ = 14 per week spent studying by full-time students at four-year colleges in the United States. To determine whether this average has changed in recent years, a researcher selected a sample of n = 64 of today’s college students and obtained an average of M = 12.5 hours . If the standard deviation for the distribution is σ = 4.8 per week, does this...

Babcock and Marks (2010) reviewed survey data from 2003-2005, and obtained an average of u =...

Babcock and Marks (2010) reviewed survey data from 2003-2005, and obtained an average of u = 14 hours per week spent studying by full-time students at 4-year colleges in the United States. To determine whether this average has changed in the past 10 years, a researcher selected a sample of n = 64 of today’s college students and obtained an average of M = 12.5 hours. If the standard deviation for the distribution is σ = 4.8 hours per week,...

Consider the following price data from 2002 to 2010 Year 2002 2003 2004 2005 2006 2007...

Consider the following price data from 2002 to 2010 Year 2002 2003 2004 2005 2006 2007 2008 2009 2010 Price 3.34 3.56 3.61 4.06 4.25 4.37 4.68 4.59 4.81 a. Compute the simple price index using 2002 as the base year. (Round your answers to 2 decimal places.) Year Price index 2002 2003 2004 2005 2006 2007 2008 2009 2010 b. Update the index numbers with a base year revised from 2002 to 2005. (Round your answers to 2 decimal...

In 2003 a survey of 35,000 adults showed that 26% were smokers. In 2010 a survey...

In 2003 a survey of 35,000 adults showed that 26% were smokers. In 2010 a survey of 45,000 adults showed that 21% were smokers. Construct a 95% confidence interval for the true difference between proportions. a) (4.41% , 5.59%) b) (3.33% , 6.67%) c) (4.82% , 5.18%) d) (3.83% , 6.17%)

Year 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 Dividend $ 7.46 $ 7.91...

Year 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 Dividend $ 7.46 $ 7.91 $ 8.38 $ 8.80 $ 9.24 $ 9.70 $ 10.28 $ 10.79 $ 11.33 $ 12.01 Find both the arithmetic growth rate and the geometric growth rate of the dividends for Davy's Crock Pot Stores. Assuming the January 1, 2011 price of the stock is $110.00, determine the current required rate of return for the company (use the geometric growth rate to calculate the...

Suppose we have data from a health survey conducted in year 2000. Data were obtained from...

Suppose we have data from a health survey conducted in year 2000. Data were obtained from a random sample of 1000 persons. An OLS linear regression analysis was carried out in the following way: Dependent Variable: Systolic blood pressure (SBP, in mmHg) Independent Variables: Gender (1 if female, 0 if male) Age (in years) Education (binary variables for “Not graduated from high school” and “Graduated from high school (but not from college)”; the reference category is “Graduated from college”) A...

1.:The following sample was obtained from a population with μ = 80 and σ = 12....

1.:The following sample was obtained from a population with μ = 80 and σ = 12. Find the z-score corresponding to the sample mean. M = 84 for a sample of n = 36; 2. For a normal population with μ = 70 and σ = 12, find the following. (a) What is the probability of obtaining a sample mean greater than 73 for a sample of n = 36 scores? (b) What is the probability of obtaining a sample...

estion 1 (7 marks) (This question is from the Week 3 Tutorial) You have reviewed the...

estion 1 (This question is from the Week 3 Tutorial) You have reviewed the work performed by your assistant, Raymond Snow, on the audit of Tin Ltd for the year ended 30 June 20X8 and you have noted the following two independent matters: (i) In testing investments in listed securities, Raymond selected all shareholdings with a market value above $200,000 and checked them to the closing market value reported by the Australian Stock Exchange (ASX) to determine the net realisable...

Question 1 (7 marks) (This question is from the Week 3 Tutorial) You have reviewed the...

Question 1 (This question is from the Week 3 Tutorial) You have reviewed the work performed by your assistant, Raymond Snow, on the audit of Tin Ltd for the year ended 30 June 20X8 and you have noted the following two independent matters: (i) In testing investments in listed securities, Raymond selected all shareholdings with a market value above $200,000 and checked them to the closing market value reported by the Australian Stock Exchange (ASX) to determine the net realisable...

In 1997, the average household expenditure for energy was $1,338, according to data obtained from the...

In 1997, the average household expenditure for energy was $1,338, according to data obtained from the U.S. Department of Energy. An economist claims that energy usage today is different from its 1997 level. In a random sample of 36 households, the economist found the mean expenditure, adjusted for inflation, for energy in 2004 to be $1,423. with a sample standard deviation s = 360. At a 95% level of confidence (α = .05), we wish to test the economists claim. 1. State...

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1) Babcock and Marks (2010) reviewed survey data from 2003–2005, and obtained an average of μ...

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1) Babcock and Marks (2010) reviewed survey data from 2003–2005, and obtained an average of μ...

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1.:The following sample was obtained from a population with μ = 80 and σ = 12....

estion 1 (7 marks) (This question is from the Week 3 Tutorial) You have reviewed the...

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In 1997, the average household expenditure for energy was $1,338, according to data obtained from the...