# biostatistic

posted by .

recent suggestion is 60 min of exercise per day. A sample of 50 adults in a study of risk factor report exercising a mean of 38 min per day with a standerd deviation of 19 min .based on sampal data, is physical activity significantly less than recommended? Run the appropriate test at a 5% level of significance.

• biostatistic -

Use a one-sample z-test.

z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size)

z = (38 - 60)/(19/√50) = ?

Finish the calculation.

Check a z-table at .05 level of significance for a one-tailed test.
If the z-test statistic exceeds the critical value from the z-table, reject the null and conclude ยต < 60 (which is the alternative hypothesis). If the z-test statistic does not exceed the critical value from the z-table, do not reject the null.

I hope this will help get you started.

## Similar Questions

1. ### college-Stats

A certain geyser was determined to have eruptions with a Mean duration of 3.31 min and a standard deviation of 1.04 min. A sample of n=43 eruptions were recorded. Using Chebychev's Theorem, how many of the eruptions lasted between …
2. ### MATH!!

TO be on the 1-km race team, Celia must have a mean time less than 5 min 50 secs in 6 tryout games. Her times in 5 races are: 6 min 2 s, 5 min 53 s, 5 min 53 s, 5 min 45 s, 6 min, and 5 min 34 s. WHat itme should Celia aim for in her …
3. ### math

289 min = 4 hr and 49 min 213 min = 3 hr and 33 min 345 min = 5 hr and 45 min 197 min = 3 hr and 17 min I have to change these minutes on the left to hours and minutes. could you check if I have them correctly. Thank you for your help
4. ### Math

Please help me solve these problem i have no idea how to do this. 720m/d= ____ m/min 1.5gal/min=______ qt/h 32yd/min=_____in./s 0.85km/s=______m/min 80mi/h=_______ft/s 20fl oz/min=_______qt/day
5. ### health

i was completing my study guide so i can study and i ran across these questions and needed help?
6. ### statistics

Mean time 79 min Standard deviation 8 min what is the probability of doing it in 60 min or less
7. ### math

amos is using a computer program to graph the function N(p)=-73p-2818. He wants to see the intercepts. Which minimum values should he use to set up the viewing window?
8. ### Accounting

variable cost, fixed cost, total costif .10 per min long dist calling based on 100 min, 240 min, and 540 min
9. ### accounting

paying a fixed monthly fee of \$15.00 up yo 240 min then .08 per min if i use less than 240 min still paying 15.00 per mo. based on 100 min 240 min 540 min
10. ### accountung

a fixed mo fee of 22.00 up to 510 min. then .05 per min thereafter if i use less than 510 min i still pay 22.00 per month based on 100 min/ 240 min. 540 min.

More Similar Questions

Post a New Question