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There is a 25% chance that a fuse of a certain type is defective. Approximate the probability of having more than or equal to 15 defective fuses in a box containing 30 fuses.
Let X equal to the grade of a student in a stat course. Suppose that X is N(u, 100). Using the traditional method of teaching, the average student grade was u=60.
A manufactured battery is defective with the probability of 5%.In a lot of n=200 batteries, approximate the probability that at most 12 car batteries are defective.
An electronic company manufactures resistors that have a mean resistance of u= 100 ohm and a standard deviation s= 10 ohm. Find the probability that a random sample of n= 36 resistors will have a re
The diameter of a certain buleet is known fo have a normal distribution with Standard deviation= 0.01cm. A random sample of size 10 yields an average diameter of 1.50cm. Find a 99% two sided confide
In a test of a method of gender selection, a trial is designed so that five couples give birth to five children. How many gender sequences are possible?
You have a box with 3 red, 4 white, and 2 blue balls in it. Suppose you take two balls out of a box without replacement what is the probability that the second is blue?
Colormetric method is used to test lake water for nitrates. If water specimens contain nitrates, a solution dropped into the water will cause the specimen to turn red 95% of the time.
A sample space (S) contains four sample points E1, E2, E3, E4. List all possible events in S including the null event.
In a sample of discharge of suspended solids from a phosphate mine, it was noted that the mean daily discharge was 27 mg/L and variance was 196. Assuming that the daily discharge is approximately no
If the coach must start a lineup with one center, two forwards and two guards, how many possible lineups can the coach choose?
Suppose two customers are chosen at random from the list of all customers. What is the probability that both customers will pay their monthly bill in full?
One year later a survey of computer workstations found 106 Sun, 73 HP, 84 IBM, 45 Digital and 90 other. Test at the 10% level of significance whether changes have occurred during the 1-year period.
Weight status category and the corresponding percentiles and BMI ranges for 10-year-old boys in the states table.
Suppose you purchase a lottery ticket. What is the probability that your 3-digit number will be the winning number? Which of the probability approaches (subjective, classical, or relative frequency)
What is the incidence rate of waterborne diseases in Africa? A patient suffering from a waterborne disease is randomly chosen from a clinic in an African village. What is the probability that this pa
What is the probability that a randomly chosen man will develop prostate cancer? What is the probability that a randomly chosen man has a PSA level greater than 10, given that he has prostate cancer?
The nuchal translucency test is a special ultrasound scan which is widely used as a screeding test for Down's syndrome in early pregnancy. The test measures the uid under the skin at the back of the
What is the expected value of the sample mean weight? Give an exact answer. What is the standard deviation of the sample mean weight? Give your answer to four decimal places.
Comparison of the degree of linear correlation are considered most accurate in terms of:
You are interested in the relation between the number of years working for a particular company and loneliness at work. You survery 40 workers at this company and figure a correlation between these
Marist reported that the margin of error for one of these results was 9 percentage points and for the other it was 2:5 percentage points. Which result had the margin of error of 9 percentage points?
Two variables X and Y, have a strong linear correlation. Under what condition can you determine the direction of causality just from knowing the correlation coefficient?