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A random sample of 121 checking accounts at bank showed an average daily balance of $280 the standard deviation of the population is known to be $6.
Find the standard error of the meangive the point estimate of the population meanconstruct a 80% confidence interval estimates for the meanconstruct a 95% confidence interval for the mean
FedEx and United Parcel Service (UPS) are the world's leading cargo carriers by volume and revenue (The Wall Street Journal, January 27, 2004).
Utilizing a binominal experiment, that is each trail can be reduced to two outcomes, construct a binomial distribution.
Compute the value of the test statistic (to 2 decimals).
Gas station sells 1400 gallons of gasoline per hour if it charges $ 2.05 per gallon but only 1100 gallons per hour if it charges $ 2.95 per gallon. What should gasoline price be to sell 1000 gallons per hour?
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Does Lavastatin reduce the risk of heart attack? In a Texas Study, researchers gave Lovastatin to 2,325 people, and a inactive substitute to 2,081 people, with an average age of 58. After 5 years, 57 of the lovastatin group suffered a heart attack..
The manager of a local gymnasium has determined that the length of time patron spend at the gymnasium is normal distributed with mean 80minutes and standard deviation 20 minutes. What is the patrons who spend more than 120 minutes at the gymnasium..
Find the value of Z-score- standard normal distribution.Find out a value of the standard normal random variable z, call it z0.
Twelve doctor's offices were given 3 lab inspections with the following results:
The president of Crooked Arrow National Bank wants to determine whether more than 60% of the banks loans are made to persons residing in Crooked Arrow.
After polling every 8 th graduate, a major university estimated annual salary of its alumni to be $103,000. What sampling technique was used?
In a random sample of 500 families owning sets in the town was found that 340 subscribed to ASTRO. Find a 95% confidence interval for actual proportion of families in this town who subscribe to ASTRO.
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