Suppose a baker wants to know, on average, how many pastries they sell in a day. They sampled over 4 days. On the first day they sold 10, on the second day they sold 12, on the third day they sold 18, and on the fourth day they sold 16. The population standard deviation of pastry sales is 3. What is the point estimate (average) number of pastries sold? 26 08 056 O 14 Nex
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- Calculate the sample size to study the average age of a Central State College student, plus or minus 0.4 years. We’d like to be 85% confident about our result. From a previous study, we know that the standard deviation for the population is 2.8.The average cost of tuition plus room and board for a small private liberal arts college is reported to be $8500 per term but I financial administrator boys that the average cost is half a study conducted using 350 small liberal arts colleges showed that the average cost per term is $8745 the population standard deviation is $1200 let a =0.05.what is the p-value for this testIs it true or false that the least absolute deviations (LAD) estimator minimizes the sum of the absolute value of the population errors.
- a. 36 Out of 100 persons interviewed are familiar with the tax incentive given by the governmenti for installing solar panel, construct 96% confidence interval for true proportion. b. The average wages of 25 employees of a company are RS. 2500 with standard deviation of Rs. 250. Assuming wages to be normally distributed, calculate 98% confidence upper bound for the average wages and interpret it.ASAP Exercise 7-48 (Algo) (LO7-3) According to a government study among adults in the 25- to 34-year age group, the mean amount spent per year on reading and entertainment is $2,125. Assume that the distribution of the amounts spent follows the normal distribution with a standard deviation of $439. (Round your z-score computation to 2 decimal places and final answers to 2 decimal places.) a. What percent of the adults spend more than $2,400 per year on reading and entertainment? b. What percent spend between $2,400 and $3,400 per year on reading and entertainment? c. What percent spend less than $1,000 per year on reading and entertainment?SCCoast, an Internet provider in the Southeast, developed the following frequency distribution on the age of Internet users. Find the mean and the standard deviation. (Round squared deviations to nearest whole number and final answer to 2 decimal places.) Age (years) Frequency 10 up to 20 3 20 up to 30 7 30 up to 40 18 40 up to 50 20 50 up to 60 12
- Consider the following data: −11,−5,−5,−11,13,−11,−5−11,−5,−5,−11,13,−11,−5 Copy Data Step 2 of 3: Calculate the value of the sample standard deviation. Round your answer to one decimal place.Engineers must consider the breadths of male heads when designing helmets. The company researchers have determined that the population of potential clientele have head breadths that are normally distributed with a mean of 6.6-in and a standard deviation of 0.9-in.In what range would you expect to find the middle 50% of most head breadths? Between _____________ and __________________.If you were to draw samples of size 37 from this population, in what range would you expect to find the middle 50% of most averages for the breadths of male heads in the sample? Between _______________ and ________________.Enter your answers as numbers. Your answers should be accurate to 2 decimal placesssy In a sample of 134 ball bearings, the average diameter was found to be 3.78mm with a standard deviation of 0.44 . Give a point estimate for the population variance of the diameter of the ball bearings. Round your answer to two decimal places, if necessary.
- A lathe is set to cut bars of steel into lengths of 6 centimeters. The lathe is considered to be in perfect adjustment if the average length of the bars it cuts is 6 centimeters. A sample of 121 bars is selected randomly and measured. It is determined that the average length of the bars in the sample is 6.08 centimeters with a standard deviation of 0.44 centimeters. Compute the p-value for testing whether the population mean is larger than 6 centimeters. NOTE: WRITE YOUR ANSWER WITH 4 DECIMAL DIGITS. DO NOT ROUND UP OR DOWN.A sample of 20 observations from a normal distribution with standard deviation 4.51 gives amean of 32.8. Does this data support that the mean of the population is greater than 30 at0.05 significant level?The Philadelphia office of Price Waterhouse Coopers LLP hired five accounting trainees this year. Their monthly starting salaries were: $3,536; $3,173; $3,448; $3,121; and $3,622. (I) Compute the population mean. (II) Compute the population variance. (III) Compute the population standard deviation. (IV) The Pittsburgh office hired six trainees. Their mean monthly salary was $3,550, and the standard deviation was $250. Compare the two groups