**(1) UNICEF.REC**

(A) Laos has the highest low birth weight rate (39%); Spain has the lowest (1%).

(B) The United States has a rate of 7% which is greater than or equal to 36.7% of the other observations. Therefore it is no more than
the 36.7th percentile.

(C) Histogram - click here. Data are "skewed right."

(D) Summary stats: n = 109, mean = 11.147, SD = 6.417, min = 1 max = 39

(E) A 95% CI for µ = (9.9, 12.4). Comment: Even though data are skewed, the sample is large enough (*n* = 109) to allow a normally
based confidence interval.

**(3) SERZINC.REC**

(A) Descriptive stats reported by Epi Info

Total Sum Mean Variance Std Dev

462 40627 87.937 256.150 16.005

Minimum 25%ile Median 75%ile Maximum

50.000 76.000 86.000 98.000 153.000

(B) Frequency analysis and histogram -- see serzinc.pgm for commands used to produce output

SERZINCG | Freq Percent Cum.

-----------+-----------------------

40 TO 59 | 6 1.3% 1.3%

60 TO 79 | 145 31.4% 32.7%

80 TO 99 | 207 44.8% 77.5%

100 TO 119 | 93 20.1% 97.6%

120 TO 139 | 7 1.5% 99.1%

140 TO 159 | 4 0.9% 100.0%

-----------+-----------------------

Total | 462 100.0%

Click here for histogram.

(C) 95% CI for µ:(86.5, 89.4)

(D) *H*_{0}: µ = 85 vs. *H*_{1}: µ not = 85; let a = .05; *t*_{stat} = 3.95, *df* = 461; *p *= .00009, reject H_{0}. A significant difference between the
hypothesized population mean of 85 and the sample mean of 87.9 was found.