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The capacity of an elevator is 10 people or 1630 pounds. The capacity will be exceeded if 10 people have weights with a mean greater than 1630/10=163 pounds.
In a town there are on average 2.4 children in a family and a randomly chosen child has on averate 1.55 siblings. Determine the variance of the number of children in a randomly chosen family.
A certain adjustment to a machine will change the length of the parts it makes but will not affect the standard deviation. The length of the parts is normally distributed, and the standard deviation
A sample of 20 of 171 funded projects revealed that 11 were valued at $18,000 each and 9 were valued at $20,200 each. From the sample data, estimate the total value of the funding for all the projec
What are the appropriate H0 and Ha for each of the following research studies? In addition, note whether the hypothesis test is one- or two-tailed.
A study in which researchers want to test whether nurses who work 8-hour shifts deliver higher-quality work than those who work 12-hour shifts. c. A study in which researchers want to determine whet
Calculate the expected value and the variance of X. Calculate P(X>0.5) and P(0.2<X<0.5)
Translate the statement into a confidence interval for p. Approximate the level of confidence. In a survey of 1000 U.S. adults, 19% are concerned that their taxes will be audited by the Internal Rev
Same question that I have asked earlier but need to derive the objective function and constraints and solved using Management Scientist Software.
Perform a hypothesis test to see if there is significant evidence to conclude that there is an interaction between the grow-light and the plant food used? Perform a hypothesis test to see if there i
Suppose that a data set has a minimum value of 24 and a maximun of 79 and that you want 5 classes. Explain how to find the class width for this frequency table. What happens if you mistakenly use a
When using the normal approximation to the binomial, what is the standard deviation for a binomial probability distribution with p =.3 and n = 145?
Wayne Collier designed an experiment to measure the fuel efficiency of his family car under different tire pressures. For each run, he set the tire pressure and then measured the miles he drove on a
Heights for college women are normally distributed with mean = 65 inches and standard deviation = 2.7 inches. Find the proportion of college women whose heights fall into the following ranges:
What is the probability that a randomly selected student spends more than $240 on textbooks this semester? What is the probability that a randomly selected student spends between $240 and $450 on text
The cards are sold in boxes of 20. What is the probability that two or more cards in the box do not fit into the 6 inch envelope?
Suppose 10 players are selected at random out of eighteen possible people, where 15 are women and 3 are men, with each player assigned to one of the 10 distinct positions. Each outcome is equally li
A photographer works part-time in a shopping center, two hours per day, four days per week. On the average, six customers arrive each hour, and the arrivals appear to occur independently of one anot
You think that the return could be modeled as a normal random variable with mean $2000 and standard deviation $1500. What is the probability that the investment will end up with a loss? What is the
After observing a long run of red on a roulette wheel, many gamblers believe that black is bound to occur. Such a belief often is called the gambler's fallacy because the roulette wheel has no memor
What is the probability of obtaining two tails in a row when flipping a coin?
Suppose a shipment of 50 cell phones has arrived from your supplier, The Samsing Manufacturer. As the engineer for your company you are concerned that there may be defective cell phones in the shipm
Suppose that eight of the 25 radios are randomly selected to be stored under a shelf where the radios are displayed, and the remaining ones are placed in a storeroom. Let X = the number among the ra
An electronics store has received a shipment of 25 table radios that have connections for an iPod or iPhone. Ten of these have two slots (so they can accommodate both devices), and the other fifteen
A certain number of dollars is placed in each of two envelopes. The amounts differ from one another, but you do not know what the values of the two amounts are.