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Find the probability for Normal distribution.
ACT scores of high school seniors. The scores of high school seniors on the ACT college entrance examination in 2003 had mean JL = 20.80 and standard deviation (J = 4.80. The distribution of scores is only roughly Normal.
(a) What is the approximate probability that a single student randomly chosen from all those taking the test scores 23 or higher?
(b) Now take an SRS of 25 students who took the test. What are the mean and standard deviation of the sample mean score x of these 25 students?
(c) What is the estimated probability that the mean score x of these students is 23 or higher?
(d) Which of the two Normal probability calculations in (a) and (c) is more accurate and Why?
If there are 5 choices for a question and there is a 50% chance that the student knows the answer, what is the probability that the student knew the answer to a question he correctly answered?
Whenever the calculated value of t is equal to or greater than the tabled value of t, for a given number of degrees of freedom, then
Looking at the data, the manufacturer is incorrect in its label claim. Perform hypothesis testing to prove or disprove it. Is the manufacturer correct in its label claim? Explain.
What is the chance that stock will fall by more than 15% next month? What extra assumption are you making when replying this question?
Create a 90% confidence interval for proportion of all kernels that would not pop.
Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of two her..
Find the probability that the number of who consider themselves basketball fans is :
Determine for each variable if it is the explanatory variable, the response variable, or whether it could be both.
Write down the probability of that the median of the sample or average medians is greater or more than 320 minutes?
Utilizing form of Regression method which would give you highest performing model to forecast Sales. Utilizing your model forecast the sales
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho= 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
Graph the distribution using a histogram. Calculate the mean and standard deviation.
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