The life of an electrical bulb, measured in hours, has a Weibull distribution with a median of 18,859 hours and shape parameter of 1.053. What proportion of bulbs fail within the 8000 hours? Answer Choices: a. 0.2889 b. 0.2859 c. 0.2449 d. 0.2981

For which measure of center must the data be ranked? A. Mode B. Standard Deviation C. Median D. Mean

Eyeglassomatic manufactures eyeglasses for different retailers. They test to see how many defective lenses they made the time period of January 1 to March 31. The table gives the defect and the number of defects. Do the data support the notion that each defect type occurs in the same proportion? Test at the 5% level. Number of Defective Lenses Defect type Number of defects Scratch 1866 Right shaped - small 1935 Flaked 1979 Wrong axis 1921 Chamfer wrong 1864 Crazing, cracks 1991 Wrong shape 2004 Wrong PD 1895 Spots and bubbles 1917 Wrong height 1885 Right shape - big 1875 Lost in lab 1886 Spots/bubble - intern 1935   State the hypotheses.H0: Each defect type     in the same proportion.Ha: Each defect type     in the same proportion. Calculate the χ2 test statistic. Round expected values to two decimal places. Round χ2 to three decimal places.χ2 =  Calculate the p-value. Round to four decimal places.p-value =  State your decision.Since p-value     0.05,…

An investigation of the properties of bricks used to line aluminum smelter pots was published in an article. Six different commercial bricks were evaluated. The life span of a smelter pot depends on the porosity of the brick lining (the less porosity, the longer the life span); consequently, the researchers measured the apparent porosity of each brick specimen, as well as the mean pore diameter of each brick. See the table. Apparent Porosity (y). Mean Pore Diameter (x). Click the icon to view the table. Data table Mean Pore Diameter Apparent Porosity (%) (micrometers) Brick Interpret the y-intercept of the line. Choose the correct answer below. 18.7 12.0 В 18.3 9.8 O A. The y-intercept is Bo- This value has no meaning because 0 is not in the observed range of the independent variable mean pore diameter. 16.3 7.3 6.9 5.4 O B. The y-intercept is Bo: For each unit increase in mean pore diameter, the mean porosity is estimated to increase by B0- 17.2 10.9 O C. There is not enough…

Listed below are the measured radiation absorption rates (in W. 5-number summary. 1.12 0.52 0.51 0.92 0.7

Draw a box plot for the following data: Median: 4.5 Lowest Value: 1 Greatest Value: 9 Lower Quartile: 2.5 Interquartile Range: 6 8 10

Use the following cell phone airport data speeds​ (Mbps) from a particular network. Find the percentile corresponding to the data speed 0.9 Mbps. Percentile of 0.9 equals  ​(Round to the nearest whole number as​ needed.)

When performing a test about the population proportion, what distribution would you need to use? Select one: O a. z O b. chi-square O c.t

The indicated IQ score, x, is

A survey is carried out at a university to estimate the percentage of undergraduates living at home during the current term. What is the population? the parameter?