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1) Using Table B, if N = 20
and P = 0.20,
(C) What is the probability of getting
a result as extreme as or more extreme than
two P events?
2) Thirty-five biased coins are flipped once. The
coins are weighted so that the probability of a head with any coin
is 0.25. What is the probability of getting at
least 16 heads?
3) In your voting district, 30% of the voters are
against a particular bill and the rest favor it. If you randomly
poll seven voters from your district, what is the
probability that
(a) None will favor the bill?
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the Ph.D. program of her department is particularly good; that it
attracts exceptional graduate students, and consequently, the Ph.D.
students of her department earn their Ph.D.'s in significantly less
time than do their counter parts in other psychology departments.
To test this belief, she compares the time it took students to earn
their Ph.D.'s in her department over the past three years, with
national data for the same time period. In the past three years,
this department has awarded 35 Ph.D.'s; the mean time to obtain the
Ph.D. was 62.0 months, with a standard deviation of 6.2 months.
National data for psychology departments throughout the United
States compiled for that time showed that the mean time to obtain a
Ph.D. was 78.4 months, with a standard deviation of 11.7 months,
and the distribution of these scores was normally distributed.
(c)
Using 𝛼 = 0.012 tail, what do you
conclude?
Find------- zcrit= +/-
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A primatologist believes that rhesus monkeys possess curiosity. She reasons that, if this is true, then they should prefer novel stimulation to repetitive stimulation. An experiment is conducted in which 12 rhesus monkeys are randomly selected from the university colony and taught to press two bars. Pressing bar 1 always produces the same sound, whereas bar 2 produces a novel sound each time it is pressed. After learning to press the bars, the monkeys are tested for 15 minutes, during which they have free access to both bars. The number of presses on each bar during the 15 minutes is recorded. The resulting data are as follows: Subject Bar 1 Bar 2 1 16 31 2 20 30 3 20 31 4 13 26 5 3 19 6 22 21 7 15 35 8 35 45 9 14 29 10 5 15 11 27 29 12 34 36