CHALLENGE 6.2.1: Confidence intervals for population means. АCTIVITY 270604.2179714.gx3zgy7 Jump to level 1 Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 5 inches. The heights of 7 randomly selected students are 73, 75, 62, 74, 62, 71 and 60. T= Ex: 12.34 O Margin of error at 99% confidence level = Ex: 1.23 99% confidence interval = [ Ex: 12.34 Ex: 12.34 ] [smaller value, larger value] Check Next D- D.

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A: 2. Let x be the incomes are approximately normal distribution with mean $33,000 and standard…

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A: (1).Purchased value of the car is:  P=$23000After every year the value of the car is decreased by…

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A: Basic concept of discrete probability distribution are used

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A: The given equation is y =2x^3 -5x.The values of x =-2 and delta x= 0.1.

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A: Given that We have to find z score that divide a normal distribution The middle 25% from the 75% in…

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A: Z-score = (x-mean)/standard deviation  For normal distribution :  Mean = 0 Standard deviation = 1…