Standard error of the sample mean equals
A population which includes 500 observations has mean of 40 and standard deviation of 15. A sample of size 100 is taken at random from this population. The standard error of the sample mean equals:
Select one:
a. 2.50.
b. 12.50.
c. 1.343.
d. 1.50.
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Use the first two Bonferroni inequalities to compute an upper and a lower bound on the probability that in a group of 60people, at least 3 were born on the same day.
The amount of time it takes for student to complete statistics quiz is uniformly distributed (or, given by random variable that is uniformly distributed) between 29 and 58 minutes. One student is chosen at random. Determine the probability of the
It is found that when a particular 4-sided die is rolled a 1 occurs 24.2% of the time, a 2 takes place 26.3% of the time, a 3 takes place 27.1% of the time, and a 4 takes place 22.4% of the time. If the die is rolled 32 times, determine the probab
The manager of a supermarket tracked the amount of time required for customers to be served by the cashier. After checking with his statistics professor,
Body fluids were examined from patients with a Chondrosarcoma over the time initial treatment and remission. The levels of a particular chemotherapeutic drug were followed over a selected week.
Suppose X has an exponential distribution with mean = 25. Calculate P(X < 30|X > 10).
The estimate of the population proportion is to be within plus or minus 0.05, with a 99% level of confidence. The best estimate of the population proportion is 0.12. How large a sample is required?
Your state is considering raising legal age for consumption of alcoholic beverages to 21 years old. How large a sample size must be taken to make an estimate of the true proportion of citizens who favor this move. The error should be no more than
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