At wind speeds above 1000 centimeters per second (cm/sec), significant sand-movi

Question

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. Wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. The cyclic nature of wind and moving sand determines the shape and location of large dunes. At a test site, the prevailing direction of the wind did not change noticeably. However, the velocity did change. Sixty-one wind speed readings gave an average velocity of x = 1075 cm/sec. Based on long-term experience, can be assumed to be 250 cm/sec. (a) Find a 95% confidence interval for the population mean wind speed at this site. (Round your answers to the nearest whole number.)

lower limit _____ cm/sec

upper limit ______ cm/sec

Explanation / Answer

formula

I : xbar +/- Z * sigma / srqt N

alpha / 2 = 0.025 Z= 1.96 from tables

1075 +/- 1.96 * 250 / srqt 61

1075 +/- 62.738

1012.262 < miu < 1137.738

1013 < miu < 1138

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