STATISTIK-FORUM.de

[Rafaela]

hallooo, ich denke diese bsp sind nicht schwer für jemanden der sich einbisschen in statistik auskennt!
vielleicht kann mir jemand von euch helfen! wäre euch sooo dankbar!!
lg Rafaela

1. (a) Let x1; x2; : : : ; xn be a given data set with mean X
. Now let yi = xi + c, for
i = 1; 2; : : : ; n be a new data set with mean Y , where c is a constant. What will be
the value of Y compared to X
?
(b) Let x1; x2; : : : ; xn be a given data set with mean X
. Now let yi = cxi, for i =
1; 2; : : : ; n be a new data set with mean Y , where c is a constant. What will be the
value of Y compared to X
?
(c) Calculate the mean of 2 4 10 5 1.
(a) compare it with the mean of 12 14 20 15 11
(b) compare it with the mean of 20 40 100 50 10.

2. (a) Suppose that you have an investment which earns 15% in the rst year, 45% in the
second year, and 35% in the third year. What is its average rate of return?
(b) Now suppose that you have an investment which earns 20% in the rst year, loses
10% in the second year, and earns 30% in the third year. What is its average rate
of return?

3. Three coins are tossed. First dene its sample space
and then calculate the probability
that both heads and tails appear at least once.

[PonderStibbons]

Da fehlt die Dokumentation dessen, was Du selber bisher erarbeitet hast.

Mit freundlichen Grüßen

P.