The average length of time required to complete a college achievement test is approximately normal with a mean of 75 minutes and a standard deviation of 13 minutes. When should the test be terminated (in minutes) if you wish to allow sufficient time for 80% of the students to complete the test? (Round your answer to two decimal places.)    Answer:_______________min You may need to use the appropriate appendix table to

The authors of the paper "Evaluating Existing Movement Hypotheses in Linear Systems Using Larval Stream Salamanders"+ investigated whether water temperature was related to how far a salamander would swim and whether it would swim upstream or downstream. Data for 14 streams with different mean water temperatures where salamander larvae were released are given (approximated from a graph that appeared in the paper). The two variables of interest are x = mean water temperature (°C) and y = net directionality, which was defined as the difference in the relative frequency of the released salamander larvae moving upstream and the relative frequency of released salamander larvae moving downstream. A positive value of net directionality means a higher proportion were moving upstream than downstream. A negative value of net directionality means a higher proportion were moving downstream than upstream. Mean Temperature (x) Net Directionality (y) 6.17 -0.08 8.06 0.25 8.62 -0.14 10.56 0.00 12.45…

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Previous Question Find the area of the shaded region. The graph to the right depicts IQ scores of adults, and those scores with a mean of 100 and a standard deviation of 15. Click to view page 1 of the table, Click to view page 2 of the table. 95 125 The area of the shaded region is (Round to four decimal places as needed.)

Using the square root of x sign above, you will be able to find symbols and equations.  Subscripts are also at the top.  X2    X2 Now that you have calculated SS. Calculate  variance and standard deviation using  the same distribution of scores from a population.   3, 7, 8, 5, 6, 4, 9, 10, 7, 8, 6, 5

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Using your favorite statistics software package, you generate a scatter plot that displays a linear form. You find a regression equation and the standard deviation for both variables. The standard deviation for x is 1.12, and the standard deviation for y is 4.12. The regression equation is reported as y=-4.7 +1.41x  What fraction of the variation in y can be explained by the variation in the values of x? (Enter your answer as a decimal between 0 and 1.)

IQ tests supposedly measure our intelligence. They typically are ‘normed’ so that they have a mean of 100 and a standard deviation of 15. (Higher scores show higher intelligence.) Use the graph and use the z-score and percents from columns b and c in Table A, when relevant. If you scored 132, what is your z-score? (Interpret.) Use table A  X, z(a), (b), and (c) X z (a) (b) (c)          and use the graph! Write down or save your response to use in Part 2 of this quiz. Group of answer choices -2.53 z. I'm at the 98.34 percentile rank and 1.66% of people scored smarter than me. 2.13 z. I'm at the 98.34 percentile rank and 1.66% of people scored smarter than me. -2.13 z. I'm at the 1.66 percentile rank and 98.34% of people scored smarter than me. 2.53 z. I'm at the 0.57 percentile rank and 99.43% of people scored smarter than me. 2.13 z. I'm at the 1.66 percentile rank and 98.34% of people scored smarter than me. 2.53 z. I'm at the 99.43 percentile rank…

please answer in text form and in proper format answer with must explanation , calculation for each part and steps clearly