Dentists’ use of anesthetics. Refer to the Current Allergy&Clinical Immunology study of the use of local anestheticsin dentistry, presented in Exercise . Recall thatthe mean number of units (ampoules) of local anestheticsused per week by dentists was 79, with a standard deviationof 23. Consider a dentist who used 175 units of localanesthetics in a week.
a. Find the z -score for this measurement.
b. Would you consider the measurement to be an outlier? Explain.
c. Give several reasons the outlier may have occurred.
Dentists’ use of anesthetics. A study published in Current Allergy&Clinical Immunology (Mar. 2004) investigatedallergic reactions of dental patients to local anesthetics.Based on a survey of dental practitioners, the studyreported that the mean number of units (ampoules) oflocal anesthetics used per week by dentists was 79, with astandard deviation of 23. Suppose we want to determinethe percentage of dentists who use less than 102 units oflocal anesthetics per week.
a. Assuming that nothing is known about the shape of the distribution for the data, what percentage of dentists use less than 102 units of local anesthetics per week?
b. Assuming that the data has a mound-shaped distribution, what percentage of dentists use less than 102 units of local anesthetics per week?
Dentists’ use of anesthetics. A study published in Current Allergy&Clinical Immunology (Mar. 2004) investigated allergic reactions of dental patients to local anesthetics. Based on a survey of dental practitioners, the study reported that the mean number of units (ampoules) of local anesthetics used per week by dentists was 79, with a standard deviation of 23. Suppose we want to determine the percentage of dentists who use less than 102 units of local anesthetics per week.
a. Assuming that nothing is known about the shape of the distribution for the data, what percentage of dentists use less than 102 units of local anesthetics per week?
b. Assuming that the data has a mound-shaped distribution, what percentage of dentists use less than 102 units of local anesthetics per week?
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