Statistics Questions
Explore questions in the Statistics category that you can ask Spark.E!
binary, independent, (number of trials not fixed,) same (fixed) probability,
percent of values less than or equal to you
for each additional x, predicted y increases/decreases by _
Standard Deviation of Sampling Distribution of x̄
How much your response variable changes when your explanatory variable changes by 1 unit
Standard Deviation of Sampling Distribution of p̂
Mean of the Sampling Distribution of p̂
Mean of the Sampling Distribution of x̄
T/F: Correlation between X and Y is the same as that of Y and X
T/F: R is NOT the percentage of variation?
To estimate the proportion of students who support a smoke-free campus, you compute the proportion that say yes after responding to an email sent to all students asking "Do you support a smoke-free campus?" The data collected is
Researchers conducted a study on the effectiveness of a knee surgery to cure arthritis. It was randomly determined whether people got the knee surgery. Everyone who underwent the surgery reported feeling less pain. Is this evidence that the surgery causes a decrease in pain?
Predicted value for a regression line
True or False: The t distribution is used to construct confidence intervals for the population mean when the population standard deviation is unknown.
The margin of error of a confidence interval is
What is the best point estimate for P in order to construct a confidence interval for P?
Suppose a 98% confidence interval for μ turns out to be (1000, 2100). If this interval was based on a sample of size n=25, explain what assumptions are necessary for the interval to be valid.
To select the correct Student's t-distribution requires knowing the degrees of freedom. How many degrees of freedom are there for a sample of size n?
A 95% confidence interval for the average salary of all CEOs in the electronics industry was constructed using the results of a random survey of 45 CEOs. The interval was ($97,911, $110,014). To make more useful inferences from the data, it is desired to reduce the width of the confidence interval. Which of the following will result in a reduced interval width?
The critical value of a distribution is the value of