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كمان إذا امدك هل لسؤالين.........

29. A survey claims that the average cost of a hotel room in a city is $69. To test the
claim, a researcher selects a sample of 40 hotel rooms and finds that the average cost
is $67.56. The standard deviation of the population is $3.86. At α =0.05, do we
reject Ho and why?
A) Yes, because the critical value is 1.96
B) No, because the critical value is 1.96
C) Yes, because test value falls in the critical region
D) No, because the test value doesn't fall in the critical region
الجــــــــــواب : c


Urn 1 contains 5 red balls and 3 black balls. Urn 2 contains 3 red balls and 1 black
ball. Urn 3 contains 4 red balls and 2 black balls. If an urn is selected at random and
a ball is drawn. Find the probability it will be red?
A)
2
3
B)
49
72
C)
23
72
D)
49
24
الجواب :b )) 49/ 72 ))