# A sample of 49 sudden infant death syndrome (SIDS) cases had a mean birth weight of 2998 g

A sample of 49 sudden infant death syndrome (SIDS) cases had a mean birth weight of 2998 g

1. A sample of 49 sudden infant death syndrome (SIDS) cases had a mean birth weight of 2998 g. Based on other births in the county, we will assume σ = 800 g. Calculate the 95% confidence interval for the mean birth weight of SIDS cases in the county. Interpret your results

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2. True or false? Given that a confidence interval for µ is 13 + 5.

a. The value of 13 in this expression is the point estimate.

b. The value 5 in this expression is the estimate’s standard error.

c. The value 5 in this expression is the estimate’s margin of error.

d. The width of the confidence interval is 5.

3. When do we use a t-statistic instead of a z-statistic to help infer a mean?

4. Identify whether the studies described here are based on (1) single samples, (2) paired samples, or (3) independent samples.

a. Cardiovascular disease risk factors are compared in husbands and wives.

b. A nutritional exam is applied to a random sample of individuals. Results are compared to the results of the whole nation.

c. An investigator compares vaccination histories in 30 autistic schoolchildren to a simple random sample of non-autistic children from the same school district.

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