What percent of the standard normal z-distribution lies between z = -0.5 and z = 0? (Round your answer to two decimal places.) %
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What percent of the standard normal z-distribution lies between z = -0.5 and z = 0? (Round your answer to two decimal places.)
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- A researcher claims that at least 10% of all football helmets have manufacturing flaws that could potentially cause injury to the wearer. A sample of 200 helmets revealed that 16 helmets contained such defects. Does this finding support the researcher's claim? Use a = 0.03. Find the P-value. The proportion of football helmets with flaws The P-value is i ✓ 10%. . Round your answer to four decimal places (e.g. 12.3456).Find the value of t0.025 for a t-distribution with 14 degrees of freedom. Round your answer to three decimal places, if necessary.About what percent of x values from a normal distribution lie within two standard deviation (left and right) of the mean of that distribution? 0% 4.3% 27% 68% 95% 99.7% 100%
- Investigators are trying to determine if the contamination of a town well led to significant increases in adverse health effects. During the period of time when water was consumed from this contaminated well, there were 16 birth defects among 414 births. After this well was shut off, there were 3 birth defects among 228 births. You asked to determine if the rate of birth defects was higher when the contaminated well was in use. a. Test the claim that the contaminated well was not associated with a change in the rate of birth defects in the community at the alpha = 0.05 level, by using the two-proportion z test. Confirm your answers using Stata. b. Calculate a 95% confidence interval for the true difference between the proportions of birth defects when the contaminated well was in use versus when the well was shut down. c. Construct the 2x2 contingency table representing the data to Calculate the odds of a birth defect when the contaminated water was consumed and when the well was shut…The Z-score tells you the number of standard deviations away from the mean (and X-μ can be used to find the in what direction) a data value is. The formula: Z Z-score for a single member of the population. Notice X - μ tells you the signed distance the data value (X) is from the mean. When you divide that by the size of each chunk (the standard deviation) you are measuring the distance in units of the size of the standard deviations (how many standard deviations fit in the distance between the data value and the mean) - which gives you the Z-score. σ The formula X = μ+Z. can be used to find the value in the population when given the Z-score (signed number of standard deviations). Notice that Z. tells you how far from the mean the data value is (since Z is the number of standard deviations and is the size of each standard deviation the product tells the total distance). So adding the distance from the mean to the mean gives the location along the number line for the data value. A…Ho;p=0.77 H1;p>077 your sample consists of 136 subjects, with 100 sucesses calculate the t statistics rounded to 2 decimal places
- A large automobile insurance company selected samples of single and married male policyholders and recorded the number who made an insurance claim over the preceding three-year period. Single Policyholders Married Policyholders n1=550 n2=1,000 Number making claims = 110 Number making claims = 150 a. Use a=0.05 Test to determine whether the claim rates differ between single and married male policyholders. z-value (to 2 decimals) p-value (to 4 decimals) b. Provide a 95% confidence interval (to 4 decimals) for the difference between the proportions for the two populations. Enter negative answer as negative number. ( , )Among freshmen at a certain university, scores on the Math SAT followed the normal curve, with an average of 550 and an SD of 100. The SAT score of a student whose score is at the 75th percentile is closest to what value? 665 590 690 620me of a CIA agent is greater than $81,623 (based on data from payscale.com) given that the test statistic is t = 1 20 for a sample of 40 CIA agents. 4. P-Value Find the P-value in a test of the claim that the mean annual 1.304
- What is the z-score of x = 3 if it is 2 standard deviation to the left of the mean? -3 -2 1 O 2 1.Among freshmen at a certain university, scores on the Math SAT followed the normal curve, with an average of 550 and an SD of 100. The SAT score of a student whose score is at the 99th percentile is closest to what value? Group of answer choices 780 400 760 805Mean (Average): 76 Population Standard Deviation, σ 19 Total Numbers, N 45 What is the z-score for a grade of 65? What is the probability of randomly choosing a score that is 65 or more?
