appropriate estimates, confidence intervals and test statistics, answer the following questions. e. (i) Did inflation-adjusted (real) wages of high school graduates increase between 1992 and 2012? Is this difference significant at the 5% level? (ii) Did inflation-adjusted (real) wages of college graduates increase between 1992 and 2012? Is this difference significant at the 5% level? (iii) Did the gap between earnings of college and high school graduates increase between 1992 and 2012? Is this difference significant at the 5% level?

One question from a survey was "how many credit cards do you currently have? " the results of the survey are provided. complete parts (a) through (g) below. click the icon to view the survey results. (a) determine the mean number of credit cards based on the raw data. the mean is 3.113.11 credit cards. (type an integer or a decimal. do not round.) (b) determine the standard deviation number of credit cards based on the raw data. the standard deviation is 1.9111.911 credit cards. (round to three decimal places as needed.) (c) determine a probability distribution for the random variable, x, the number of credit cards issued to an individual. x (# of cards) p(x) x (# of cards) p(x) 1 0.280.28 6 nothing 2 nothing 7 nothing 3 nothing 8 nothing 4 nothing 9 nothing 5 nothing 10 nothing (type integers or decimals. do not round.)

Every 10 years, the federal government sponsors a national survey of health and health practices (nhanes). one question in the survey asks participants to rate their overall health using a 5-point rating scale. what is the scale of measurement used for this question? ratio ordinal interval nominal

An instance where sellers should work to keep relationships with customers is when they instance where selllars should work to keep relationships with customers is when they feel that the product