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Q1) Which of following is valid probability value for discrete random variable?
a) 0.22
b) 1.01
c) -.75
d) All of the above
e) None of the above
Q2) The J.O. Supplies Company purchases calculators from Korean supplier. Probability of defective calculator is 10%. If 15 calculators are chosen at random, determine the probability that 3 or more of calculators will be defective?
Q3) Of all individual tax returns, 37% include errors made by taxpayer. If IRS examiners are allotted randomly selected returns in batches of 12, determine mean and standard deviation for number of erroneous returns per batch.
a) µ=2.80, σ=1.67
b) µ =4.44, σ =1.67
c) µ =4.44, σ =2.80
d) µ =2.80, σ =2.10
Q4) Assume that airplane engine will fail, when in flight, with probability 1-p independently from engine to engine; assume that airplane will make a successful flight if at least 50% of its engines remain operative. For what values of p four-engine plane is preferable to two-engine plane? Describe your selection for probability distribution.
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours. A random sample of four students was taken in order to estimate the mean study time for the population of all students.
College Students' Seating Choices and Motivation to Achieve.This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
What percentage of bottles can we expect to have a volume less than 32 oz?
Basic Statistics problem
A savings account was opened for a baby on 1985 with a $100 deposit. No withdrawals or deposits occurred since the account was opened. The current balance of the account is $246.47. Measured in dollars of the year in which the account was opened, how..
Describe the factors that might cause variation in weight of Tootsie Rolls during manufacture.
the probability that a household is both prosperous and educated is P (A and B) = 0.082. What is the probability P (A or B) that the household selected is either prosperous or educated.
Create a 95% confidence interval for true mean.
Compute average daily rainfall in the week and for weekends. Get the average of weekdays' rainfalls and average of weekend's rainfalls.
Would you use a one-tailed or two-tailed test? Explain your response.
The following table shows the number of miles driven in each trial.
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