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- 9. Suppose X ~ N(2, 3). What value of x has a z-score of −0.67? (Enter an exact number as an integer, fraction, or decimal.)x =We wish to demonstrate that the average time to graduate from school is afected by the students who have taken AP calculus in hgh school. Specially, we wish to demonstrate the students who have taken AP calculus in high school graduate an average of more than .25 years sooner than students who have not taken AP calculus in high school. If we let μ1 denote the average time to graduate for students who have not taken AP calculus and μ2 dentoe the average time to graduate for students who have taken AP calculus, what is the apropriate null hypothesisnote that n is approaching infinity
- 16- When are Gregory-Newton forward and backward interpolation formulas used?a)When calculating the y value corresponding to x, which is less than the first x0 in the x and y values table. B)When calculating the y value corresponding to the last x greater than x in the table of x and y values. NS)When calculating the y value corresponding to the x's in the x and y values table. D)When calculating the y value corresponding to x, which is not among the x's located in the x and y values table. TO)While calculating the y value corresponding to x located at the intermediate points of the x in the table of x and y values.2- The researcher hypothesized 85% of the students (n=185) surveyed will improve test scores from C grade to B grade. Select the correct number of students expected to increase from a C grade to B grade. In the space below type the answer in steps.is it p=value is suppose to be 0.0401 not 0.0395 to according z-table of -1.75
- 16. A machine produces bolts which are N(4, 0.09), where measurements are in mm. bolts are measured accurately and any which are smaller than 3.5 mm or bigger than 4.4 mm are rejected. Out of a batch of 500 bolts how many would be acceptable?17 first drop down- more than 5% points apart or within 5% points of eachother second drop down- less than, about the same, more thanSuppose we roll a six-sided die 10 times, and let X be the number of rolls where the die at least 5. What is E[X]? Please show work for credit.
- A medical researcher says that less than 77% of adults in a certain country think that healthy children should be required to be vaccinated. In a random sample of 400 adults in that country, 73% think that healthy children should be required to be vaccinated. At α=0.05, is there enough evidence to support the researcher's claim? Complete parts (a) through (e) below.how to slove x over 5 =-7A study of n = 2252 adults age 18 or older found that 72% of the cell phone users send and receive text messages.15 A study of n = 800 teens age 12 to 17 found that 87% of the teen cell phone users send and receive text messages. What is the best estimate for the difference in the proportion of cell phone users who use text messages, between adults (defined as 18 and over) and teens? Give notation (as a difference with a minus sign) for the quantity we are trying to estimate, notation for the quantity that gives the best estimate, and the value of the best estimate. Be sure to clearly define any parameters in the context of this situation.