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Your favorite newspaper, newsmagazine, or news-related website is a rich source of descriptive statistics on a variety of topics. Examine the past week's news;
describe at least five instances of actual data presented. These can include surveys, experiments, business data, and even sports information.
Suppose in fact that 47% of the population favors this idea. Use the normal distribution to calculate the probability that at least half of the sample are in favor.
A city official has stated that 20% of the items sold by pawn shops within the city have been stolen. Ralph has just purchased 4 items from one of the city's pawn shops.
Compute P(X) using the binomial probability formula. Then determine whether the normal distribution can be used to estimate this probability. If so, approximate P(X) using the normal distribution and compare the result with the exact probability. ..
the random variables x and y have expected values 8 and 25 standard deviations 4 and 9 respectively.a calculate the
construct a confidence interval of the population proportion at the given level of confidence. x105 n150 95
The length of a Colorado brook trout is normally distributed. What is the probability that a brook trout's length:
A simple random sample of 1600 families is chosen. What is the chance that between 9% and 11% of the sample families will not own car?
With reference to Example 3, use suitable statistical software to find the P-value that corresponds to t = -0.49, where t is a value of a random variable having the t distribution with 4 degrees of freedom. Use this P-value to rework the example.
Three cards are randomly selected from an ordinary deck of cards without replacement Compute the probability that the first card is a spade given that the second and third are spades.
The ages (in days) at time of death for samples of 11 girls and 16 boys who died of sudden infant death syndrome are shown in Table E4.22. Calculate separately for boys and girls the 95% confidence interval for the (population) mean of age (in day..
Following are some representative scores. (High scores represent more favorable attitudes.) Calculate for both before and after scores, and write a conclusion based on the standard deviations.
The amount of pyroxidine (in grams) per multiple vitamin is normally distributed with a mean = 110 grams and a variance = 25 grams. A sample of 25 vitamins is to be selected.
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