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At a certain neuromuscular junction the average mepp is 0.7 mV. When the nerve is stimulated, 200 responses of amplitude 0.7 mV are observed and 100 of amplitude 1.4 mV.
The students are randomly assigned to freshman writing seminars in groups of 25. What might the mean GPA of one of these seminars group be? Describe the appropriate sampling distribution model, incl
A military commander wishes to destroy an enemy bridge. Each flight of planes he sends out has a probability of 0.7 of scoring a direct hit on the bridge. It takes four direct hits to completely des
Construct a 90% confidence interval for the mean sale time for all homes in the neighborhood.
An applience store has a rule that any credit purchase over $200 needs to be approved by the supervisor. It is known that credit purchases are normally distributed with mean $130 and standard deviat
The table below shows the typical mass of eight animals. Plot and label these values on a log scale. How many orders of magnitude larger is a blue whale than a hummingbird?
A normal distribution has mean value 100 and ? (standard deviation) 15, find the area in (a) (65<x<85) (b) (110<x<160). Let x have an exponential distribution with mean ?>0.
If a blue whale is 2.7 times larger than a fin whale, how many orders of magnitude larger is the blue whale?
Suppose that x1, ... x10 are a random sample of 10 observations from the following probability mass function, where 0 less than theta less than 1 is a parameter:
What kind of relationship exists between employees' scores the manual dexterity test and their performance ratings? suppose a candidate scored 44 on the manual dexterity test.
Replacement of paint on highways and streets represents a large investment of funds by state and local governments each year. A new, cheaper brand of paint is tested for durability after one month's
An automobile manufacturing company uses 10 industrial robots. The probability that any particular robot will be inoperative is .05, independednt on the other robots,
Suppose that on-the-job injuries in a textile mill occur at the rate of 0.1 per day. What is the probability that 2 accidents occur in a 30-day period?
A doctor knows from experience that 15% of the patients to whom she gives a certain drug will have undesirable side effects. Among the 13 patients to whom she gives the drug, find the following prob
A sample survey interviews an simple random sample of 267 college women. Suppose (as is roughly true) that 70% of all college women have been on a diet within the past 12 months. what are the standa
According to acturial tables, the probability is .03 that a person aged 70 will die within 1 year. A comapny insures 6,400 people of age 70. What is the probability that 200 or more of these people
IQ is normally distributed with mean 100 and standard deviation 12, and height is normally distributed with mean 70 and standard deviation 2 inches. What percentage of the population satisfies the c
An urn contains four green and three blue balls. You take one ball out of the urn, note its color, and replace it. You then take a second ball out of the urn, note its color, and replace it.
1) A random sample of 19 colleges yielded a mean cost of college education $30500 per year with SD of $3000. Find the samping distribution of the sample mean. (let the cost of all college education
You pick 3 cards from a standard deck of 52 cards. Find the probability that the third card is and ace. Compare this with the probability that the first card is an ace.
Calculate an approximate 95% confidence interval for the percent of all Americans that supported allowing daily prayer to be spoken in the classroom at the time of the 2014 survey.
The numbers of hours worked (per week) by 400 statistics students are shown below.
The amount of liquid placed in a soft drink cup is normally distributed with mean 10.5 ounces and standard deviation .5 ounce. If we buy two drink, what is the probability that each cup contains les
The diameter of steel rods made by a comapny are normally distributed with mean 2 inches and standard deviation .02 inch. A rod is defective if its diameter is less than 1.95 inches. What percent of