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Calibrating a scale: Making sure that the scales used by businesses in the United States are accurate is the responsibility of the National Institute for Standards and Technology (NIST) in Washington, D.C. Suppose that NIST technicians are testing a scale by using a weight known to weigh exactly
grams. The standard deviation for scale reading is known to be
. They weigh this weight on the scale
times and read the result each time. The
scale readings have a sample
grams. The calibration point is set too low if the mean scale reading is less than
grams. The technicians want to perform a hypothesis test to determine whether the calibration point is set too low. Use the
level of significance and the
-value method
Compute the value of the test statistic. Round the answer to two decimal places.
z
=
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- What proportion of babies weigh between 11.2 and 16 pounds?arrow_forwardIdentify the symbols used for each of the following: (a) sample standard deviation; (b) population standard deviation; (c) sample variance; (d) population variance. If sample data consist of weights measured in grams, what units are used for these statistics and parameter a. The symbol for sample standard deviation is b. The symbol for population standard deviation is c. The symbol for sample variance is d. The symbol for population variance is If sample data consist of weights measured in grams, then correctly complete the following sentences. a. The unit for sample standard deviation would be b. The unit for population standard deviation would be C. The unit for sample variance would be ▼ d. The unit for population variance would be ▼ Carrow_forwardA survey is carried out at a university to estimate the percentage of undergraduates living at home during the current term. What is the population? the parameter?arrow_forward
- Find the standard deviation (rounded to the nearest unit) for the data indicated. Test Score Frequency 90 1 80 4 70 7 60 6 50 3arrow_forwardThe four levels of measurement scale are Nominal, Ordinal, Interval and Ratio. What can be computed with each type (Frequency, Median, Mean, Standard Deviation, Standard error, Ratio, Coefficient of variation)?arrow_forwardWhat is the population standard deviation using the following formulaarrow_forward
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