Question:

Lake Macatawa, an inlet lake on the east side of Lake Michigan, is divided into an east basin and a west basin. To measure the effect on the lake of salting city streets in the winter, scientists took 32 samples of water from the west basin and measure the amount of sodium in parts per thousand to make a statistical inference about the unknown mean ?.

Given: Sample mean= 19.06, sample variance = 10.598, CI= (17.89

a. Another type of estimation is a prediction interval, where the focus is on estimating the value of the next observation. Note that prediction intervals use the ? standard deviations of the underlying distribution (not the ? of the sampling distribution). Assume that the measures for the random variable of sodium in the west basin are normally distributed, create two 95% prediction intervals: one using T distribution and one using a Z distribution . You may need to find a t?/2 with 31 degrees of freedom on the Internet. Since 32 is quite close to the n ?30, what are the differences in the intervals developed?

b. Suppose that there was another sample that had a measurement of 40.7 ppt and since it was outside the prediction intervals in part a., it is considered an outlier. If sodium levels are linked to harmful bacteria growth, what follow up or reporting changes would be performed due to this outlier? Suppose automated data collection and analysis in this area is a planned; what a procedure would be used for detecting and handling outliers?

ent/406551/viewContent/10433157/View 2.3 Quartiles and Box Plots Construct and Understand Box-and-Whisker Plots Question Given the following box-and-whisker plot, what is the third quartile of the data?3. Using weighted-average cost, calculate ending inventory, cost of goods sold, sales revenue, and gross profit. (Round "Weighted-Average Cost p unit" to 4 decimal places) Cost of Goods Available for Sale Cost of Goods Sold - Weighted Ending Inventory - Weighted Average Average Cost Cost Weighted Average Cost Average Cost of Goods Average # of units Average # of units Cost per Available for # of units Cost of in Ending Cost per Ending Cost per unit Sale Sold Unit Goods Sold Inventory unit Inventory Beginning Inventory 59 3.009 Purchases: Apr 07 130 7.367 Jul 16 209 11.704 Oct 06 119 6.783 Total 520 S 54.8726 26,863 445 5 65.3333 24.623 22 $ $3313 1.166 Sales revenue 30,706 Gross profit 6,017Which of the following statement is correct? Select one: O a. Weighted Average method is preferable to be used to get in detail information about the cost. O b. Weighted Average method consider the beginning cost in its calculation of total cost of completed and transferred out units. O c. Weighted Average used when businesses is manufacturing small quantity of units. O d. Weighted Average is used to calculate the average cost per equivalent unit.What is the definition of the average isotopic mass? check all that apply Group of answer choices the weighted average of the # of protons and electrons of the isotopes in an element the weighted average of the masses of the isotopes in an element the weighted average of the charges of the isotopes in an element the weighted average of the number of protons and neutrons of the isotopes in an element