Statistics Questions
Explore questions in the Statistics category that you can ask Spark.E!
What is the intersection of 2 events in probability notation?
equation of margin of error for a 95% confidence interval
what is the equation for level of confidence
confidence interval for population proportion on a calculator
critical values of standard normal distribution equation
what would happen to the width of the confidence interval if we increased the confidence level?
increasing our confidence level allows us to be more confident that our interval contains the population mean, but
standard deviation is the ______ of the variance
when the raw score is above the mean & you're being asked how much area is BELOW (or raw score below the mean & asked how much ABOVE)
compared to the z-distribution, the t-distribution is (more peaked/flatter), especially when N is (small/large)
as sample size increases, the variability of the sampling distribution of the sample means ________
confidence interval refers to the (population/sample) mean
variance ______ is the standard deviation
a good rule of thumb is that we can assume the sampling distribution of sample means will be normally distributed if...
For a confidence interval for a mean to be valid, certain assumptions must be met. From the following list, choose ALL that are always necessary.Observations must be independentObservations in the sample(s) must be representative of the population form which the sample is drawnThe sample data must be normally distributedThe population data must be normally distributedThe sample(s) must be greater than 25.Either the population data must be normally distributed or the sample(s) size(s) must be equal to or greater than 25.
The difference between the standard error of the mean and the standard deviation of data from a single population is that the standard error estimates the variability among means of random samples of the same size from that population while the standard deviation estimates the variability of individuals in the population, true or false?
If you have a sample size of 50 to assess the length of hospital stay (often a skewed variable) from a population which is non-normally distributed with unknown standard deviation, which of the following methods would be best to employ for standardization of the sample mean?
If you calculate a 95% conference interval for the true mean weight of adult men and find it is from 130 bs to 280 lbs, it can be correctly interpreted as
If you calculate a confidence interval for the difference between 2 means for paired data the correctnumber of degrees of freedom is equal to:
In calculating a confidence interval for the difference in means assuming equal variances and twoindependent samples of n1 = 30 and n2 = 30, the corresponding t-statistic should be obtained using