The percentage of physicians who are women is 27.9%. in a survey of physicians employed by a large
university health system, 45 of 120 randomly selected physicians were women. is there sufficient evidence at the 0.05
level of significance to conclude that the proportion of women physicians at the university health system exceeds
27.9%?

Step-by-step explanation:

Given that the percentage of physicians who are women is 27.9%. In a survey of physicians employed by a large  university health system,

45 of 120 randomly selected physicians were women.

Sample size n = 120

Sample proportion p =

H0: p = 0.279

Ha: p >0.279

(Two tailed test at 5% significance level)

p difference = 0.096

STd error of p assuming H0 true

=

Test statistic Z =

Z critical value one tailed is 1.645

Since Z statistic > 1.645 we reject H0

There is evidence to conclude that the proportion of women physicians at the university health system exceeds

27.9%

answer: i'm not sure

step-by-step explanation:

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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