## Description

a. n1=400 p1=.65 n2=400 p2=.58

b. n1=180 p1=.31 n2=250 p2=.25

c. n1=100 p1=.46 n2=120 p2=.61

someone please help and explain to me how this works!!! Much appreciated

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## Explanation & Answer

95 % conidence interval :

95% Tabular value =1.96

p1-p2 - 1.96 *sqrt (p1*(1-p1)/n1+p2*(1-p2)/n2)

p1-p2 + 1.96 *sqrt (p1*(1-p1)/n1+p2*(1-p2)/n2)

n1 | 400 | 180 | 100 |

n2 | 400 | 250 | 120 |

p1 | 0.65 | 0.31 | 0.46 |

p2 | 0.58 | 0.25 | 0.61 |

SE | 0.034318 | 0.044027 | 0.066832 |

p1-p2 | 0.07 | 0.06 | -0.15 |

Tabular value | 1.96 | 1.96 | 1.96 |

Lower Limit | 0.003 | -0.026 | -0.281 |

Upper Limit | 0.137 | 0.146 | -0.019 |

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