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A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 30.
Following are the American College Test (ACT) scores attained by the 25 members of a local high school graduating class:21 24 23 17 31 19 19 20 19 25 17 23 1621 20 28 25 25 21 14 19 17 18 28 20
Find P99, P90, and P80 for the ACT scores. [Hint: Use nk/100 to find the location in the ordered data for each percentile.]
Compute test statistic and p -value for each sample. (Negative amount must be pointed out by minus sign.)
Assume duration of human pregnancies follow mound-shaped distribution with mean of 266 days and the standard deviation of 16 days.
A researcher hypothesizes that parents with school-aged children are more probable to vote in favour of a referendum increasing public school spending than adults without school-aged children, but wonders of this relationship holds for both Democr..
The sample mean of the number of spots on the 6000 rolls, should be about If this die is rolled 6000 times, the number of times we get a 2 or a 3 should be about
Find the percent of a standard Normal model found in the given region. Round to the nearest hundredth of a percent.
Design a contingency table that will hold your data. What are your degrees of freedom and critical value at a 0.05 confidence level? You do not need data to answer this.
Translate this into a statistical hypothesis-testing problem and carry out the test. Be sure to give the null and alternative hypotheses, the value of the test statistic, the p-value, and your conclusions.
Find the expected value of the number of tests taken.
The student body of a large university comprises 60% female students. Elucidate what is the probability that the students in the sample exactly two are female?
Use the relative frequency approach to construct a probability distribution for the number of tests taken.
Assess the model fit for the multiple linear regression model using appropriate statistics and graphics.
Recent crime reports indicate that 5.2 motor vehicle thefts occur each minute in the United States. Assume that the distribution of thefts per minute can be approximated by the Poisson probability distribution.
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