In a survey of 9 people, it was found that an average of $37 was spent on their child's last birthday gift with a standard deviation of $16. Estimate the mean amount people spent on their child's last birthday gift with 99% confidence. Round your answers to three decimal places, and use four decimal places for any interim calculations. We are 99% confident that the interval amount spent on their child's last birthday gift. Which conditions are required for the validity of the interval? Select all that apply. n known fl Uo known contains the true population mean μ Random sample Normal population

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A soft drink machine outputs a mean of 29 ounces per cup. The machine's output is normally distributed with a standard deviation of 4 ounces. What is the probability of filling a cup between 25 and 31 ounces? Round your answer to four decimal places. Answer esc If you would like to look up the value in a table, select the table you want to view, then either click the cell at the intersection of the row and column or use the arrow keys to find the appropriate cell in the table and select it using the Space key. angle. 9 ! 1 9 a Z ← @ 2 W S X # 3 e d C C $ 4 r f % 5 V t Oll A 6 Normal Table - to-z Normal Table - to z b y h & 7 n O u * 8 3 O i N ( 9 k O < 1 alt ) 0 1 Р O - : Tables ; Submit Answer 4 ? 1 + = Keypad Keyboard Shortcuts 31 11 1 Oct 28 }. backspace 1 USE YOUR SMARTPHONE FOR 2:53 3 D45 enter

A psychologist has designed a questionnaire to measure individuals' aggressiveness. Suppose that the scoreson the questionnaire are normally distributed with a standard deviation of 100. Suppose also that exactly15% of the scores exceed 750. Find the mean of the distribution of scores. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.

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A bottle of water is advertised as containing 1 liter of water.  However, after testing a few hundred bottles, you find the average amount of water is normally distributed and contains 1.07 liters on average with a standard deviation of 0.05. What percent of bottles have exactly 1 liter? Please solve in excel.

Apply Chebyshev’s rule to solve Exercises. A quantitative data set has size 40. At least how many observations lie within two standard deviations to either side of the mean?

A random sample of 64 shoppers showed that they spend an average of $27.31 per visit at the Sunday Mornings Bookstore. The standard deviation of the population is $2.14. Find the 90% confidence interval of the true mean. Please include all work showing how you found your answer.

A psychologist has designed a questionnaire to measure individuals' aggressiveness. Suppose that the scores on the questionnaire are normally distributed with a standard deviation of 80. Suppose also that exactly 15% of the scores exceed 750. Find the mean of the distribution of scores. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.