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The service time for customers at Stylum Barber Shop follows a normal distribution with a population standard deviation of 2 minutes. At the beginning of the fiscal year, the owner conducted a time study of 25 customers and discovered that the mean service time per customer was 12 minutes. At the .05 confidence level, can it be concluded that the mean service time is less than 15 minutes?
Step 1. State the Null Hypothesis and the Alternate Hypothesis
Step 2. Select a Level of Significance
Step 3. Select the Test Statistic
Step 4. Formulate the Decision Rule
Step 5. Make a Decision
Step 6. Interpret the Result
the 70-year long-term record for weather shows that for new york state the annual precipitation has a mean of 39.06
Normal approximation to the Binomial distribution - Evaluate the probability that at least 195 of the students are female.
The table given below shows joint probability distribution of X and Y . Determine the covariance between the X and Y ?
The owner of a local night club has recently surveyed a random sample of n=250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30.
consider the set of odd single-digit integers 13579.a make a list of all samples of sixe 2 that can be drawn from this
consider two probability spaces in the first the outcomes are all unordered subsets of size k out of a set of n
the deciles of any distribution are the points that mark off the lowest 10 and highest 10. on a density curve these are
1write your response to the following question.we often hear you can lie with statistics. this is one way of saying
I tossed a coin 6 times and recorded the outcomes - H for heads and T for tails. The first set of tosses yielded HTHTTH and the second set of tosses yielded TTTHHH. Which set of tosses is more probable to happen? And why?
can you conclude that there is a significant linear correlation between vehicle weight and variability in braking disance on a dry surface?
Last week I used a stopwatch to measure the echo time of my snare drum in the hall outside my classroom, which is 80 meters long. The average echo time was 10 milliseconds.
Why does APA recommend that we calculate a measure of effect size in addition to calculating the test statistic?
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