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1.There is a bag with 62 balls. 31 are blue and 31 are red. In 20 pulls from the bag, 20 balls are red. What is the probability with replacement that the 21st pull will be red?
a).5000
b).2500
c).000000477
d).03125
e) none of the above
2.The lengths of time bank customers must wait for a teller are normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute.
A. What proportion of bank customers waits between 3 and 4 minutes
B. What percentage wait more than 4 minutes?
C. What proportion waits between 1 and 3 minutes?
D. What percentage wait less than 1 minute?
The margin of error is = _______ (round to the nearest tenth as needed) Find the 95% confidence interval= _______ (round to the nearest tenth as needed)
Estimate the mean function of this process by generating a large number of realizations of the random process and computing the sample mean.
One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y?
The probability that house sales will increase in the next 6 months is estimated to be 0.25. The probability that the interest rates on housing loans will go up in the same period is estimated to be 0.74. The probability that house sales or intere..
use normal approximation to estimate the probability of getting exactly 48 girls in 100 births. assume that boys and
What internal and external threats are and could you provide some examples of what would be considered a threat to internal and/or external validity of a study design.
A standard deviation of five minuts. Assuming the call times are normally distributed, what percentage of calls are longer than 35 minutes.
4 7 7 5 2 9 7 6 8 5 8 4 1 5 2 8 7 6 6 9. (a) Determine three quartiles and (b) draw box-and-whisker plot of the data.
The IQs of 17 students from one area of a city showed a mean of 106 with a standard deviation of 10, whereas the IQs of 14 students from another area showed a mean of 109 with a standard deviation of 7.
Suppose ξ and ζ are two random variables with E(ξ ) = E(ζ ) = 0. Show that var(ξ ) = E(ξ 2) and cov(ξ, ζ ) = E(ξ ζ ). Notes. More generally, var(ξ ) = E(ξ 2) - [E(ξ )]2 and cov(ξ, ζ ) = E(ξ ζ ) - E(ξ )E(ζ ).
Sports and Leisure - Construct the two-way ANOVA summary table. Interpret the results. Use a = 0.001 for each hypothesis test.
Draw four graphs horizontally lined up with one another. In the first graph draw Joe’s demand curve, in the second graph draw Mary’s demand curve, in the third graph draw Ellen’s demand curve, and in the fourth graph draw the market demand curve. Be ..
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