The exercises are based on the following sample data obtained from different second-year medical students who took blood pressure measurements of the same person (based on data from Marc Triola, MD).

Systolic |
138 |
130 |
135 |
140 |
120 |

Diastolic |
82 |
91 |
100 |
100 |
80 |

If you plan to use a 0.05 significance level in a test of a correlation between the systolic and diastolic readings, what are the critical values of r?

Answer

Step 1 of 3</p>

Systolic(x) |
Diastolic(y) |
x2 |
y2 |
xy |

138 |
82 |
19044 |
6724 |
11316 |

130 |
91 |
16900 |
8281 |
11830 |

135 |
100 |
18225 |
10000 |
13500 |

140 |
100 |
19600 |
10000 |
14000 |

120 |
80 |
14400 |
6400 |
9600 |

x=663 |
x=453 |
x2=88169 |
y2=41405 |
xy=60246 |

Step 2 of 3</p>

Correlation coefficient (r) =

=

=

=0.585