TH205 - Chapter 8 Test

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WA MATH205 - Chapter 8 Test - G x

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A random sample of n, = 16 communities in western Kansas gave the following information for people under 25 years of age.

x1: Rate of hay fever per 1000 population for people under 25

98 90 120 128 93 123 112 93

125 95 125 117 97 122 127 88

A random sample of n2 = 14 regions in western Kansas gave the following information for people over 50 years old.

X2: Rate of hay fever per 1000 population for people over 50

94 108 101 95 110

110

79 115 100 89 114 85 96

(1) Use a calculator to calculate X1, $1, X2, and s2. (Round your answers to two decimal places.)

X1 =

$1 =

X7 =

$7 =

[il) Assume that the hay fever rate in each age group has an approximately normal distribution. Do the data indicate that the age group over 50 has a lower rate of hay fever? Us

a = 0.05.

( a ) What is the level of significance ?

State the null and alternate hypotheses .

O Ho: H1 = H2i H1: H1 > Hz

O Ho: H1 > H2; H1: H1 = Hz

Ho: H1 = Hzi H1: H1 * Hz

O Ho: H1 = H2; H1: H1 = Hz

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