nơ. Calculate a 95% confidence interval for µ for each of the following situations: 120, a = 99.2, s = 2.12 110, a = 72.1, s = 4.26 85, I = 71.7, s 3.62 85. 7 = 73.4. 2.14 VI VI VI VI
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- The Za/2 value for a confidence interval is found as 1.29. What is the confidence level? Select one: а. 80% b. 70% c. 90% d. 83% е. 75%Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard deviation, σ, equal to 27. Approximately what percent of the population would be between 90 and 171? 1. 95% 2. 81.5% 3. 47.5% 4. 68% 5. 34% 6. 13.5%2.18 2.42 2.57 2.89 Suppose the data represent the inches of rainfall in April for a certain city over the course of 20 years. 4.79 D 0.53 0.76 1.23 1.37 1.86 3.37 3.66 3.88 4.09 4.49 5.04 5.36 5.79 Given the quartiles Q, = 2.020, Q, = 3.280, and Q3 = 4.640, compute the interquartile range, IQR. 3.19 6.08 IQR =D (Round to three decimal places as needed.)
- A nutritionist claims that children 13 to 15 years old are consuming less than the recommended iron intake of 20.5 mg. To test the nutritionist's claim of iron deficiency, a random sample of children 13 to 15 years old will be obtained. Assume that the data for iron intake follows the normal distribution with a standard deviation of 4.75 mg. Find the size of the sample that you should take if you want to estimate the true mean iron intake to within 1 mg with 99% confidence. 62 149 O 150 O 61Answer A B CTina catches a 14-pound bass. She does not know the population mean or standard deviation. So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds. Find the t and calculate a 95% (α = .05) confidence interval.
- Find the following. Enter your answer rounded to at least two decimals. z a/2 for the 97% confidence intervalTF.15 The standard deviation of a random sample of the hourly wages of 18 post office employees is s = $3.38. Assuming normal distribution, find a 95% confidence interval for the standard deviation σ. Use X2 - distribution.Find zα/2 for each of the following confidence levels used in estimating the population mean. (You may find it useful to reference the z table. Round your answers to 3 decimal places.) 88%=
- H8.lly Account Sum Next Paym Due Da Account Sump e number Apm 3. A poll of 360 randomly selected Rochesterians showed that 234 of them voted in last month's election. Find the 90% confidence interval of the true population proportion o A TEXAS INSTRUME Rochesterians who voted. a. Find the margin of error. Round to two decimal places. STAT PLOT ES TBLSET 2 WINDOW FORMA QUIT INS 2nd MODE A-LOCK LINK LIST ALPHA X,T,e,n S TEST A ANGLE B DRA MATH APPS PE b. Find the 90% confidence interval. MATRX D. SIN-1 E COS x1 SIN I | EE 10* Nu LOG ex S 4 T. L5 c. Write a statement that correctly interprets the confidence interva LN 4 RCL X L1 Y L2 STO 1 OFF CATALOG Ui ON d. Based on the results can we safely conclude that fewer than 72% of Rochester voted? Explain. Contact a writing, by ema Ju also agree the e number is a ceSuppose a population is known to be normally distributed with a mean, μ, equal to 116 and a standard deviation, σ, equal to 14. Approximately what percent of the population would be between 116 and 130? 1. 47.5% 2. 34.% 3. 68% 4. 81.5% 5. 13.5 6. 95%