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What do they mean? with confidence interval? I'm just starting out and this is part of our homework for class. I don't understand it.
A simple random sample of 10 items resulted in a sample mean of 70. The population standard deviation is = 15.
a. Compute the 95% confidence interval for the population mean. Round your answers to three decimal places. Write your answer using parentheses and a comma, in the form (n1,n2).
b. Assume that the same sample mean was obtained from a sample of 130 items. Provide a 95% confidence interval for the population mean. Round your answers to five decimal places.
Generating at least $1500 in revenue and honoring all reservations. Formulate the LP model to determine how many Raft trips and how many Sailing lessons should be scheduled.
Obtain the estimated regression function. Plot the estimated regression function and the data. Does a linear regression function appear to give a good fit here?
The gestation period for human births can be taken as normally distributed with a mean of 266 days and a standard deviation of 16 days.If a gestation period is 276 days, what percentile among human births is this?
The following is based on the normal distribution of scores with mean equal to 90 and standard deviation equal to 3.5. Determine the probability of a score falling between a raw score of 84 and 96?
use the fact that the standard normal distribution integrates to 1 to evaluate the following integral. i.e. useintegral
These predictions, however, are not very accurate. Discuss at least three reasons why these predictions may not be accurate and offer three ways in which you can increase the likelihood of accurately predicting your customers' purchases.
Calculate the probability that a randomly chosen sample of 17 games would have a sample mean less than the one you calculated in this exam. Use the standard normal distribution.
We have been informed that the stock has gone up 20%. What is the probability of a rise or fall in the GDP?
the equation for a regression line predicting the numbers of hours of tv watched by children y from the number of hours
Can researcher conclude that humidity has significant effect on eating behavior? Use a two-tail test with α = .05. Calculate estimated Cohen's d and r2 to measure size of treatment effect.
a random sample of 49 statistics examinations was taken. the average score in the sample was 84 with a variance of
Let us suppose you have taken 100 samples of size 49 each from normally distributed population. Compute standard deviation of sample means if population's variance is 16. Area to left of ‘z' is 0.9976.
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