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A candidate must gather at least 8,000 valid signatures on a petition before the deadline in order to run in an election. One candidate turns in 10,000 signatures right before the deadline, but it's always expected that some percentage of them are invalid. Election officials take a random sample of 100 signatures and thoroughly investigate them to find that 84% are valid. Is this statistically significant evidence that the candidate has enough valid signatures overall? Explain.
Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
When computing a t-test, it is important to distinguish between directional and nondirectional hypotheses as the direction will determine the rejection regions. Describe how the rejection regions would differ according to the type of hypothesis yo..
Make for more scatter plots comparing GDP growth 1970-2000 to corruption, political rights, rule of law, and socio-political instability
Do the data provide significant support for any preferences among the three brands? Test At the .05 level of significance.
Determine the 95% confidence interval for your estimate what data have you utilized as the basis of your predictions what suppositions have you made.
Which of the following is true about the random variables X, Y, and Z?
Using sample, determine a 98% confidence interval for mean weight of whole daily output.
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
Consider a random sample of size n from a normal distribution, Xi ~ N(m,9). a) Find the CRLB for the variances of unbiased estimators of m. b) Is the MLE, m(hat) = X(bar), a UMVUE of m?
In chi-square goodness-of-fit test when there is close agreement between observed frequency and expected frequency, chi-square test value will be small.
We desire to test at 0.05 level of significance whether modification increases the life of battery. What is our decision rule? Reject null hypothesis if calculated t is less than 1.96.
Findout the consumption level separating the bottom 45% to the top 55%. The September energy consumption levels for single family homes are found to the normally distributed with a mean
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