If possible, use shampoo and conditioner specially formulated for dyed hair. If you cannot find any, stick with sulfate-free shampoo and conditioner. The label should say whether or not it is sulfate-free, but double-check the ingredient label. The water does not have to be freezing, but it should be the coldest temperature that you can stand. Anything between cool and lukewarm is safe. Don't use hot water, or the dye will fade. It will also make your hair dry and frizzy. All of these can cause your hair color to fade. Cover your hair with a hat whenever you step outside, and use a swim cap whenever you go swimming in the pool or ocean. If you don't like to wear hats, try hoods or scarves. You can also spray your hair with a UV protection spray. It would be even better if you reduced it to once or twice a week. If your hair has a tendency to get oily, consider using a dry shampoo between washes.
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One-sentence summary -- Use color-safe shampoo and conditioner. Wash your hair with cool water. Limit your exposure to sunlight, sea water, and chlorine. Reduce washing your hair to 2 to 3 times per week maximum.

Q: Up to this point, the example has only dealt with 1 of the sample groups. If you are trying to compare 2 groups, you will obviously have data from both. Calculate the standard deviation of the second group of samples and use that to calculate the variance between the 2 experimental groups. The formula for variance is sd = ((s1/N1) + (s2/N2)). sd is the variance between your groups. s1 is the standard deviation of group 1 and N1 is the sample size of group 1. s2 is the standard deviation of group 2 and N2 is the sample size of group 2. For our example, let's say the data from group 2 (students who didn't read before class) had a sample size of 5 and a standard deviation of 5.81. The variance is: sd = ((s1)2/N1) + ((s2)2/N2)) sd = (((4.51)2/5) + ((5.81)2/5)) = ((20.34/5) + (33.76/5)) = (4.07 + 6.75) = 10.82 = 3.29. A t-score allows you to convert your data into a form that allows you to compare it to other data. T-scores allow you to perform a t-test that lets you calculate the probability of two groups being significantly different from each other. The formula for a t-score is: t = (1 2)/sd. 1 is the average of the first group. 2 is the average of the second group. sd is the variance between your samples. Use the larger average as 1 so you will not have a negative t-value. For our example, let's say the sample average for group 2 (those who didn't read) was 80. The t-score is: t = (1 2)/sd = (88.6 80)/3.29 = 2.61. When using the t-score, the number of degrees of freedom is determined using the sample size. Add up the number of samples from each group and then subtract two. For our example, the degrees of freedom (d.f.) are 8 because there are five samples in the first group and five samples in the second group ((5 + 5) 2 = 8). A table of t-scores and degrees of freedom can be found in a standard statistics book or online. Look at the row containing the degrees of freedom for your data and find the p-value that corresponds to your t-score. With 8 d.f. and a t-score of 2.61, the p-value for a one-tailed test falls between 0.01 and 0.025. Because we set our significance level less than or equal to 0.05, our data is statistically significant. With this data, we reject the null hypothesis and accept the alternative hypothesis: students who read the material before class get better final grades. Many researchers do a small pilot study with a few measurements to help them understand how to design a larger study. Doing another study, with more measurements, will help increase your confidence about your conclusion. A follow-up study can help you determine if any of your conclusions contained type I error (observing a difference when there isn't one, or false rejection of the null hypothesis) or type II error (failure to observe a difference when there is one, or false acceptance of the null hypothesis).
A: Calculate the variance between your 2 sample groups. Calculate the t-score of your data. Determine the degrees of freedom of your sample. Use a t table to evaluate significance. Consider a follow up study.

Article: Looking for a truly unique closing to your love letter? The outside-the-box suggestions in this section can help you make your letter even more enticing. For example, you may want to consider leaving no name at all on your letter. This can leave your reader wracking his or her brain trying to find out who the note was from you can reveal yourself when you're ready. One variation on this is to write your letter as normal, then cut your name out. Keep this slip of paper and give it to your reader a day or two later as a surprise. Do you know a language besides English? Using this for your closing can give your letter an unexpected, exotic twist ending. You may try simply translating a normal closing into your language of choice, using a figure of speech from the second language, or something else entirely. Omniglot, an online language encyclopedia, has translations of "I love you" for many different languages here. Bonus points if your second language is Italian or French the "languages of love." There doesn't have to be a "reason" for the things you include in your closing. If you're a decent artist and you think of something that would look cool next to your closing, feel free to draw it in. Most people will appreciate the time and effort that goes into a detailed sketch, so give it a shot, even if it doesn't make perfect sense in the context of the letter. Here are some things you may want to draw: Animals (ideally ones your reader likes) Plants (see above) Crests/emblems (real or imaginary) Cartoons/comics/doodles Portraits of you or your reader (use caution if this is your very first love letter to this person, this can come across as "too much") Another thing you may want to add at the end of your letter is something special just for him or her in other words, a gift. This can be almost anything, but we've included a few ideas below that are easy to paste or slip into the space next to your closing at the end of your letter. Magazine clippings that have personal meaning Leaf or flower pressings from an outdoor spot the two of you enjoy visiting Poetry passages Fortune cookie slips Movie or event tickets from something you attended together Photos of you, your reader, or both of you
Question: What is a summary of what this article is about?
Omit your name for an anonymous note. End in a different language. Draw a picture next to your closing. Include clippings or other personal objects.