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Home Question Bank Math Statistics Archive 2024 November 04

Statistics Questions from Nov 04,2024

Browse the Statistics Q&A Archive for Nov 04,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 8.1 years, and standard deviation of 1.6 year(s). If you randomly purchase one item, what is the probability it will last longer than 10 years? Enter a decimal rounded to 4 decimal places. The life of a Radio Shack record player is normally distributed with a mean of 3.3 years and a standard deviation of 0.4 years. Radio Shack guarantees its record players for 3 years. Write the definition statement for this situation. Use Stapplet or another normal calculator to find the probability that a record player will break down during the guarantee period. Enter a decimal rounded to 4 decimal places. (Use the link at the bottom of Stapplet if you need more decimal places.) 5. A researcher creates a scatter plot that displays the relationship between the number of years in business, , and the percentage of company business that is fair trade, . The researcher creates a line of best fit, , and wants to find the residuals for the companies that have been in business for 3 years. a. Find the residuals for the two points representing companies that have been in business for 3 years, and . b. Compare the residuals for the two companies who have been in business for 3 years. How are they different? How are they similar? What does the information about the residuals for the two companies tell you about their fair trade business? a. Si el circulo representa el , ¿qué porcentaje constituye cada sector circular definido por las lineas punteadas? b. ¿Qué porcentaje de las ventas le corresponde a cada electrodoméstico? 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 35 and a standard deviation of 4 . Using the Empirical Rule, what is the approximate percentage of 1 -mile long roadways with potholes numbering between 23 and 39 ? Please round to one decimal place and do not enter the percent symbol. ans = Question Help: D Post to forum The average resting heart rate of a population is 89 beats per minute, with a standard deviation of 10.5 bpm. Find the -scores that correspond to each of the following heart rates. Round your answers to the nearest hundredth, if necessary. (a) 115 bpm (b) 67 bpm 0.01 ? An international study on Hotel Chefs working hours reported that Hotel Chefs worked more than 60 hours per week on average. The South African Catering Association wanted to test whether this norm applied to South Africa. A random sample of 90 Chefs from South African Hotels was drawn and each Chef was asked to record his or her number of hours worked during given week. The sample number of hours worked per week was found to be 63.1 hours on average. Assume a population standard deviation of 8.8 hours. Test this claim at level of significance. Use the p - value approach. My daughter and 1 have argued the average length of our preacher's sermons on Sunday Find the Critical T-Value for the following information. , significance level = 0.01, one-tail. Find the Critical T-Value for the following information. , significance level , two-tail. The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 58 and a standard deviation of 7 . Using the empirical rule (as presented in the book), what is the approximate percentage of lightbulb replacement requests numbering between 58 and 65 ?
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