Employees of a large corporation are concerned about the declining quality of medical services provided by their group health insurance . A random sample of 100 office visits by employees of this corporation to primary care physicians during the year 2017 found that the doctors spent an average of 19 minutes with each patient . This year a random sample of 108 such visits showed that doctors spent an average of 15.5 minutes with each patient . Assume that the standard deviations for the two populations are 2.7 and 2.1 minutes , respectively . Using the 2.5 % level of significance , can you conclude that the mean time spent by doctors with each patient is lower for this year than for 2017 ? To draw your conclusion , state the hypotheses and identify the claim , find the critical value (s), label the acceptance and rejection region, calculate the test value and summarize the results .​

i think its a and d

step-by-step explanation:

$320 to $405

step by step explanation:

in one day he earns between $64 and $81

therefore if he works for 5 days, he will earn between 64 x 5 to 81 x 5

= $320 to $405

answer: the proof is mentioned below.

step-by-step explanation:

since, given:   lines bc = ef

prove:   lines ac > ef

          statements                                           reason

1. bc=ef                                           1. given

2. ac= ab+bc                                 2. because b is the point between the  

                                                            line segment ac

3.   ac > bc                                       3. because if a line segment is equal to

                                                          the sum of two line segments then it is

                                                          always greater then each of these

                                                          individual line segments

4. ac > ef                                         4. by equality property.