The market research firm salary. com reported that the mean annual earnings of all family practitioners in the united states was $178,258. a random sample of 55 family practitioners in los angeles that month had mean earnings of = $192,340 with a standard deviation of $42,387. do the data provide sufficient evidence to conclude that the mean salary for family practitioners in los angeles is greater than the national average? state the null and alternate hypotheses. compute the value of the t statistic. how many degrees of freedom are there? state your conclusion. use the α = 0.05 level of significance.

Lems1. the following data set represents the scores on intelligence quotient(iq) examinations of 40 sixth-grade students at a particular school: 114, 122, 103, 118, 99, 105, 134, 125, 117, 106, 109, 104, 111, 127,133, 111, 117, 103, 120, 98, 100, 130, 141, 119, 128, 106, 109, 115,113, 121, 100, 130, 125, 117, 119, 113, 104, 108, 110, 102(a) present this data set in a frequency histogram.(b) which class interval contains the greatest number of data values? (c) is there a roughly equal number of data in each class interval? (d) does the histogram appear to be approximately symmetric? if so, about which interval is it approximately symmetric?

Find the cosine function that is represented in the graph.

Solve for the equation. 4x - 13 = 2x + 9