Question

How hot is the air in the top (crown) of a hot air balloon? Information from...

How hot is the air in the top (crown) of a hot air balloon? Information from Ballooning: The Complete Guide to Riding the Winds, by Wirth and Young (Random House), claims that the air in the crown should be an average of 100°C for a balloon to be in a state of equilibrium. However, the temperature does not need to be exactly 100°C. What is a reasonable and safe range of temperatures? This range may vary with the size and (decorative) shape of the balloon. All balloons have a temperature gauge in the crown. Suppose that 58 readings (for a balloon in equilibrium) gave a mean temperature of x = 97°C. For this balloon, σ ≈ 19°C.

(a) Compute a 95% confidence interval for the average temperature at which this balloon will be in a steady-state equilibrium. (Round your answers to one decimal place.)

lower limit     °C
upper limit     °C

Homework Answers

Answer #1

95% confidence interval for is

- Z * / sqrt(n) < < + Z * / sqrt(n)

97 - 1.96 * 19 / sqrt(58) < < 97 + 1.96 * 19 / sqrt(58)

92.1 < < 101.9

Lower limit = 92.1 oC

Upper limit = 101.9 oC

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