In a standard Normal model, what value(s) of z cut(s) off the region described? Don't forget to draw a picture.
a) the highest
25%
b) the highest
97%
c) the lowest
30%
d) the middle
90%
In a standard Normal model, what value(s) of z cut(s) off the region described? Don't forget...
1. 2. 3. In a Standard Normal model, what value(s) of z cut(s) off the region described? Don't forget to draw a picture. REGION: The middle 90% 10 A 0.842 © B -0.675 O C -1.881 -1.881 0 D -1.645 to 1.645 Police department salaries in San Francisco have a mean of $90,702 and an sd of $45,321. A chief of police's salary has a z-score of z = 4.84. Interpret this z-score. O A The chief of police makes...
13. If we have a normal distribution with a mean of 75 and a standard deviation of 3. a. what z-score(s) would cut off the middle 40% of the distribution? b. what raw score(s) would cut off the lower 12% of the distribution? c, what raw score(s) would cut off the most extreme 5% of the distribution? d, what T-score(s) would cut off the upper 20% of the distribution? 13. If we have a normal distribution with a mean of...
10. What percent of a standard Normal model is found in each region? Draw a picture first. a) z2.05 b) z<-0.33 c) 1.2 <z 1.8 d) z<1.28 6. The pediatrician in Exercise 4 explains to the parents that the most extreme 5% of cases often require special treatment or attention. a) Does this child fall into that group? b) What do you need to assume about the heights of 2-year-olds to find your answer to part a?
Question 2 Normal model a. A cut-off score of 79 has been established for a sample of scores in which the mean is 67. If the corresponding z-score is 1.4 and the scores are normally distributed, what is the standard deviation? b. The standard deviation of a normal distribution is 12 and 95% of the values are greater than 6. What is the value of the mean? c. The mean of a normal distribution is 130, and only 3% of...
8 StatCrunch. IHE Normal Distribution For 1-3, draw the standard normal curve for each and shade the appropriate region. 1. The area to the left of z 1.04 2. The area between z =-34 and z-1.03 3. Find the area of zz0- 4. Dunlop Tires manufactures a tire with a lifetime that approximately follows a normal distribution with a mean of 70,000 miles and a standard deviation of 4400 miles. a. What proportion of the tires will last for a...
2. What are the parameters (Mean and standard deviation) for a standard normal distribution? 3. Find the critical value for Zoo 4. Find the z score that would give us the area in the right 30% of the standard normal curve. 5. Find the area to the left of z = -0.42. Draw a standard normal curve of the region described. 6. Find the area to the right of z=0.89. Draw a standard normal curve of the region described. 7....
Every Normal model is defined by its parameters, the mean and the standard deviation. For each model described in parts a through d below, find the missing parameter. As always, start by drawing a picture. a) μ=1250, 30% below 1200;σ=? Find the standard deviation. b) μ=0.68,15% above 0.73;σ=? Find the standard deviation. c) σ=0.9% above 13.0; μ=? Find the mean. d) σ=240, 8% below 201; μ=? Find the mean.
Under the standard normal curve, find the area of the region between Z=-0.73 and 7222 O A. 1.54 B. 4884 C.7557 D. 2211 QUESTION 24 Under the standard normal curve, find the area of the region between 2 = 1.5 and 2 = 2.5 A..9332 B..9816 C..0606 D..9938 QUESTION 25 Given the standard normal curve below and the indicated area region, determine z.
12. Using a normal distribution and z score formula answer the following questions: a. Find the Z-score that cuts off the top 35% of the nornval curve b. Find the data value to the nearest whole number that cuts off the bottom 20% of the curve given that the mean is 75 and sample standard deviation is 5. c. Find the z scores that cut off the middle 50% of the normal curve.
consider a standard normal distribution to answer the following question .draw the normal curve, shade the appropriate region and solve the following question a ) P( Z < -1.50 ) b ) P (- 1.00 < Z < 0.50 ) c ) what is the Z score that separates the upper 3% from the lower 97% of a normal distribution