# statistic

A study was conducted to determine the effectiveness of varying amounts of vitamin C in reducing the number of common colds. A survey of 450 people provided the following information:

Daily amount of vitamin C taken
None 500 mg 1000 mg
No Colds 57 26 17
At least one cold 223 84 43

What conclusion can be made? (1 point)
The data proves that vitamin C reduces the number of common colds.
The data proves that vitamin C has no effect on the number of common colds.
There appears to be an association between consumption of vitamin C and the increase of common colds.
There appears to be no association between consumption of vitamin C and the occurrence of common colds.
Since common colds are caused by viruses, there is no reason to conclude that vitamin C could have any effect.

1. 👍 0
2. 👎 0
3. 👁 667
1. Use the Chi-square (X^2) method.

X^2 = ∑ (O-E)^2/E, where O = observed frequency and E = expected frequency.

∑ = sum of all the cells.

E = (column total * row total)/grand total

df = n - 1, where n = number of cells

Look up value in X^2 table in the back of your textbook to come to your decision.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Bio physics chemistry pre medical

The vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will be vitamin a has in 500mg capsule?

2. ### Stoichiometry

4. Vitamin C, M= 176.12 g/mol, is a compound of composed of carbon, hydrogen, and oxygen. Vitamin C is found in many natural sources especially citrus fruits. When a 1.000-g sample of vitamin C is burned in a combustion apparatus

3. ### Chemistry

A 0.179 g sample of a vitamin C tablet was titrated with 0.1000 M NaOH according to the procedure in this experiment. The titration required 7.08 mL of NaOH solution. How many moles of NaOH were used in the titration? How Many

4. ### Chemistry

A sample of fresh grapefruit juice was filtered and titrated with the above I2 solution. A 100 mL sample of the juice took 9.85 mL of the iodine solution to reach the starch endpoint. a. What is the concentration of vitamin C in

1. ### Math

A researcher conducted a survey and found that people who took vitamin C every day had fewer colds than people who did not take vitamin C every day. The researcher wrote a paper stating that vitamin C prevents colds, using this

2. ### accounting

Which of the following is not one of the steps to follow when preparing a bank reconciliation statement? A. Compare the amounts of deposits in the bank statement with the amounts shown in your accounting records. B. Compare the

3. ### Science

Ten plants are grown in equal amounts of sunlight with equal amounts of water and varying amounts of fertilizer. Sunlight, water, and fertilizer are a) experiments b) systems c) variables d) controls D

4. ### Science

A vitamin C tablet was dissolved in 50.0 mL of water. The resulting solution was titrated to the equivalence point with 28.5 mL of 0.100 M I3− solution. What is the starting mass of the tablet assuming the tablet is 100% vitamin

1. ### MATH

Two social workers conducted an experiment with a group of their patients. The study asked the patients a yes or no question. For the experiment to be considered a binomial model, what must be present? Select all that apply. The

2. ### Chemistry

Liquid vitamin C, (ascorbic acid) C6H8O6 , readily reacts with atmospheric oxygen, O2, to form liquid dehydroascorbic acid, C6H6O6 and water. Explain why this is a chemical reaction. Write a balanced equation for this reaction.

3. ### statistics

Determine whether the description corresponds to an observational study or an experiment. Research is conducted to determine if there is a relation between kidney function in adults and childhood-onset diabetes.

4. ### Chemistry

Vitamin K is involved in normal blood clotting. When 2.40 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 8.05 °C. The freezing point and Kf constant for camphor can be found