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Suppose the age that children learn to walk is normally distributed with mean 12 months and standard deviation 1.4 month. 10 randomly selected people were asked what age they learned to walk. Round all answers to 4 decimal places where possible.
-What is the distribution of X ? X ~ N ( , )
-What is the distribution of x¯? x¯~ N( , )
-What is the probability that one randomly selected person learned to walk when the person was between 10.5 and 12.5 months old? ( )
-For the 10 people, find the probability that the average age that they learned to walk is between 10.5 and 12.5 months old. ( )
-For part d), is the assumption that the distribution is normal necessary? No or Yes
-Find the IQR for the average first time walking age for groups of 10 people.
-Q1 = ( ) months
-Q3 =( ) months
-IQR:( ) months
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support the consumer group's claim that fewer than 75% of the claims were settled within 5 weeks? Test using the traditional approach with α = 0.05. Determine which test statistic applies, and calculate it
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Which of the following figures has the correct p-value for testing the hypothesis that the proportion who use seat belts has changed? Explain your choice.
Suppose a study was done to determine if the mean work week has increased. 81 women were surveyed with the following results.
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Statistical procedures used to analyze test items, including, but not limited to an index of an item's difficulty and an index of an item's discrimination.
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