significance level to test th mull and alternative hypoth =H₂
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Given,
For protected groups:
sample size (n1) = 33
sample mean (x̄1) = 75.34
sample standard deviation (s1) = 11.12
For non-protected group :
sample size (n2) = 34
sample mean (x̄2) = 83.75
sample standard deviation (s2) = 18.29
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- 0/20 Question 1 of 15, Step 1 of 1 2 Correct Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.56 and a standard deviation of 0.43. Using the empirical rule, what percentage of the students have grade point averages that are between 2.13 and 2.99? Answer O Tables E Keypad How to enter your answer (opens in new window) Keyboard Shortcuts ©2022 Hawkes LearningCompany XYZ know that replacement times for the DVD players it produces are normally distributed with a mean of 10.3 years and a standard deviation of 1.2 years.If the company wants to provide a warranty so that only 3.8% of the DVD players will be replaced before the warranty expires, what is the time length of the warranty? warranty = Incorrect yearsEnter your answer as a number accurate to 1 decimal place. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.Question 30 The weight of chicken follows a normal distribution, with a mean of μ pounds and a variance of 4 pounds^2. We took a sample of 144 chicken with a sample mean of 6 pounds. What is the two-sided 95% confidence interval of μ? Note that from the z-distribution table, we know: P(Z<= -1.645) = 5% P(Z<= -1.96) = 2.5% P(Z<= -1.28) = 10%
- What would be the appropriate inferential statistic to evaluate the relationship between: • 'Generation' [Baby Boom (1946-1964), Generation X (1965-1980), Millennials (1981-1996)] • 'Household Income' (in US $) median and interquartile range means comparison (t or ANOVA) correlation coefficient (r) chi-square (x2) mean and standard deviation frequency and percentagePls help ASAP. Pls show all work.Question 6 of 15, Step 1 of 1 0/20 Correct Answer How to enter your answer topens in new window) Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.47 and a standard deviation of 1.5. Using the empirical rule, what percentage of American women have shoe sizes that are at least 11.47) Please do not round your answer. % 9 Incorrect Tables Keypad Keyboard Shortcuts
- /transcript Call centers typically have high turnover. The director of human resources for a large bank has compiled data on about 70 former employees at one of the bank's call centers. The accompanying table shows this data. In writing an article about call center working conditions, a reporter has claimed that the average tenure is no more than two years. Formulate and test a hypothesis using these data to determine if this claim can be disputed. Use a level of significance of 0.05. Click the icon to view the call center data. Is there sufficient evidence at the 0.05 level of significance that the average tenure is no more than two years? Determine the null hypothesis, Ho, and the alternative hypothesis, H₁. Ho ... H₁: (Type whole numbers.) le LeStudies show that the level of anxiety has increased since the pandemic. The average score before the pandemic was mu equal to 10. A sample of 76 individuals surveyed in the past three months produced M=12.8 and s=6.7. Based on the sample, was there a significant increase in the average anxiety level since the pandemic started at the 5% significance level? What hypothesis test is this? (a)Chi-Square Test for Independence (b)One-Sample T-Test for Mean (c)One-Sample Z-Test for Mean (d)Two-Sample T-Test for Mean22. What statistical value is obtained when the standard deviation is divided by the mean?
- based on article in toronto the response time( the time it takes before rhey arrive on the scene) for firefighters is given below 4,8,10,5,6,4,12,15,16,7,6 sum of x= ? N= ? sum of(x's)**2 = ? (sum of x)**2= ? (a)Calculate the mean and standard deviation (b) use the calculated mean and stardard deviation , what s the probability that the response time would be more than 12 minutes? (c) use the calculated mean and standard deviation, what is the probability that the response time is less than 6 minutes ? (a)Systolic blood pressure in healthy adults has a normal distribution with mean of 112 mmHg and standard deviation of 10 mmHg. Outside what range of values would we flag patients as needing follow-up, assuming we want to flag patients whose systolic blood pressure was outside of 2 standard deviations? Examined as a diagnostic test, how would sensitivity and specificity of this test change if we start flagging blood pressure values outside of 1 standard deviation instead of 2?Question 6 95 U Vetalis The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a bell-shaped distribution. This distribution has a mean of 38 and a standard deviation of 10. Using the empirical rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 8 and 48? Do not enter the percent symbol. ans = Question Help: DPost to forum