Consider a flight to be on time if it arrives no later than 15 minutes after the scheduled arrival time. The data below represents the arrival delay time in minutes. Negative numbers correspond to flights that arrived early (before the scheduled time). Use a significant level of 0.05 and the data to test the claim made by CNN that 79.5% of flights are on time. -32 -25 -26 -6 5 -15 -17 -36 -29 -18 -12 -35 2 -33 -5 0 0 -1 -33 -5 -14 -39 -21 -32 -5 -32 -13 -9 -19 49 -30 -23 14 -21 -32 11 -23 28 103 -19 -5 -46 13 -3 13 106 -34 -24

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general 10 months ago 6578

Andres boards a Ferris wheel at the 3-o'clock position and rides the Ferris wheel for multiple revolutions. The Ferris wheel rotates at a constant angular speed of 4.7 radians per minute and has a radius of 30 feet. Let t represent the number of seconds since the Ferris wheel started rotating. a. Write an expression (in terms of t) to represent the varying number of radians 8 Ryan has swept out since the ride started. Preview s height (in feet) above Preview c. Write an expression (in terms of t) to represent Ryan's height (in feet) above the ground.

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general 10 months ago 8888

The Physics Club sells E = mc2 T-shirts at the local flea market. Unfortunately, the club's previous administration has been losing money for years, so you decide to do an analysis of the sales. A quadratic regression based on old sales data reveals the following demand equation for the T-shirts: q = −2p2 + 30p (9 ≤ p ≤ 15). Here, p is the price the club charges per T-shirt, and q is the number it can sell each day at the flea market. (a) Obtain a formula for the price elasticity of demand for E = mc2 T-shirts.(b) Compute the elasticity of demand if the price is set at $9 per shirt. (Round your answer to two decimal places.) Interpret the result. (c) How much should the Physics Club charge for the T-shirts to obtain the maximum daily revenue? What will the revenue be?

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general 10 months ago 6211

A television sports commentator wants to estimate the proportion of citizens who "follow professional football." Complete parts (a) through (c). What sample size should be obtained if he wants to be within 4 percentage points with 96% confidence if he uses an estimate of 48% obtained from a poll? What sample size should be obtained if he wants to be within 4 percentage points with 96% confidence if he does not use any prior estimates? Why are the results from parts (a) and (b) so close?

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general 10 months ago 2645

5. [12 points] Minor surgery on horses under field conditions requires a reliable short-term anesthetic producing good muscle relaxation, minimal cardiovascular and respiratory changes, and a quick, smooth recovery with minimal aftereffects so that horses can be left unattended. A research article reports that, for a sample of 73 horses to which ketamine was administered under certain conditions, the sample average lying-down time was 18.9 minutes. Does this data suggest that the true mean lying-down time is less than 20 minutes? Assume that lying-down time varies according to a normal distribution with population standard deviation 8.6 minutes. Test using the level of significance α = 0.10.

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general 10 months ago 3550